## erinhass 3 years ago I need help solvin the equation x/7-8=-10

1. godorovg

okay I am ready and reporting to you help..

2. tiffanymak1996

x/7 =-10+8

3. tiffanymak1996

x/7 = -2 x=7 times -2 x=-14

4. godorovg

we are solving for x right?

5. erinhass

yes

6. tiffanymak1996

check your answer: x=-14 x/7 -8 = (-14)/7 -8 =-2-8 =-10

7. godorovg

no no you can't do that when x/7 no

8. tiffanymak1996

why?

9. godorovg

whenever you see / it means divide

10. godorovg

so therefore we x divided by 7

11. tiffanymak1996

yeah, i know, when you change sides, it becomes mutiplying

12. godorovg

correct

13. erinhass

???

14. tiffanymak1996

but you have to change sides with addition (or subtraction first before you can change sides with division)

15. erinhass

so it should be 7x=-14

16. erinhass

then divide by 7?

17. godorovg

no it's divided here so that can not happen

18. godorovg

anytime you have something divided by something you times it

19. godorovg

in order for the x or whatever you are solving for.

20. erinhass

ok, let's do this one for clarity.......1-n/5=12

21. erinhass

subtract -1 from both sides...

22. erinhass

you have n/5=11

23. erinhass

so the answer is 55?

24. tiffanymak1996

negative sign!

25. tiffanymak1996

you should have -n/5 =11

26. erinhass

-11?

27. erinhass

oh, I see!!!

28. godorovg

guys if you are doing this right than have X=??

29. erinhass

-55

30. tiffanymak1996

1- n/5 =12 1 -1 -n/5 =12-1 -n/5 =11 -n=55 n=-55

31. erinhass

yipee!

32. tiffanymak1996

gr8! just make sure you don't get confused with the signs

33. godorovg

oh I see what you are doing now, I go step by step that is why I was thrown off by what you did

34. tiffanymak1996

sry!

35. erinhass

6t +3=-7

36. erinhass

subtract 3 from both sides

37. tiffanymak1996

and you can always check your answers by substituting x=? in you equation

38. erinhass

6t=-10

39. erinhass

divide by 6?

40. tiffanymak1996

yes

41. erinhass

42. tiffanymak1996

what is -10 divided by 6?

43. erinhass

something isn't right, that is not one of my answwer choices

44. godorovg

10 goes into 2 five and 2 goes into 6 3 so the answer is -5/3

45. tiffanymak1996

well your steps are all correct...

46. erinhass

I didn't have the lowest denominator

47. tiffanymak1996

usually the answers are in simplest form, so simplify your fractions

48. tiffanymak1996

what choices do you have?

49. godorovg

Tiffany I am so sorry about this, I was trying to walk through the steps here so you could ask questions. if you have this I will go

50. erinhass

I have -5/3 as an answer

51. godorovg

no before you said -2

52. erinhass

right, but godorovg came up with -5/3 and I have that as an answer choice

53. erinhass

I did not simplify

54. godorovg

unless it says to do it I would leave as is

55. erinhass

15=-15-8u

56. erinhass

add 15 to both sides

57. erinhass

30-8u

58. erinhass

30=-8u

59. erinhass

then what?

60. erinhass

divide by -8?

61. tiffanymak1996

yes

62. erinhass

15/-4?

63. erinhass

-15/4?

64. tiffanymak1996

yes

65. erinhass

I need help with this one 0=1/6y+8=

66. erinhass

subtract 8 from both sides

67. tiffanymak1996

yes

68. erinhass

0-8 is 0?

69. erinhass

-8?

70. tiffanymak1996

yes, -8

71. erinhass

-8=1/6y

72. erinhass

now what?

73. godorovg

can I help here, this problem you are making it harder than it has be

74. tiffanymak1996

because the variable is in the denominator, therefore we have to switch it to the other side

75. tiffanymak1996

-8=1/6y -8(6y)=1/6y times 6y

76. tiffanymak1996

so you multiply both sides with 6y

77. godorovg

yes that is right, although when you first start this collect all a like terms and move then to one side and than times through the number being divided

78. erinhass

show me

79. godorovg

okay let us take this one x/7-8=-10 now here is how I would do this First take the -8 and add 8 to the -10 so now we have this x/7=-10+8 than take this and do the sub to get -2 so now we have x/7=-2 once you have than take the seven ant times to the two so now we have X= -14 like that

80. erinhass

ok

81. erinhass

-8=1/6y?

82. godorovg

okay now you tell me

83. erinhass

multiply both sides by 1/6?

84. tiffanymak1996

you multiply both sides with 6y

85. godorovg

yes

86. godorovg

but it is 1/6 not just six

87. erinhass

so y=1/6x8?

88. godorovg

yes

89. erinhass

or 48?

90. tiffanymak1996

it should be y=1/-48

91. erinhass

oh yes, because it was a -8

92. tiffanymak1996

since: 1/6y =-8 1/(6 times-8) =y so, y=1/-48

93. godorovg

yes it that is the y=1/-48

94. erinhass

okay, thanks guys! I'm tired...going to bed, goodnight! Thanks for your help!

95. godorovg

hey no problem glad I could you help you :)

96. tiffanymak1996

gd nite!

97. godorovg

tiffany great job!!

98. tiffanymak1996

u too!

99. tiffanymak1996

it's funny that when erinhass says good night , it's actually good morning for me. :)

100. godorovg

yeah and it's night time where I am as well

101. tiffanymak1996

u live in the states?

102. godorovg

yes Portland Ore

103. tiffanymak1996

oh, good for u, i've always wanted to live in the states

104. godorovg

yeah funny thing I have always wanted to leave the States

105. tiffanymak1996

guess we would all like to explore more.

106. godorovg

no not to just explore, it falls under the job market here stinks and the education system is messed up for kids, although I don't have any/

107. tiffanymak1996

i'm a victim under the education system in hong kong :(

108. godorovg

yeah i have heard about that as well. I am a math person that you can graphs in my head and will be studying Engineering Physics soon

109. godorovg

I am what some would call human calc

110. tiffanymak1996

:) good for you, sometimes i do that , and miss steps in exams, got a b instead of a, frustrating

111. godorovg

yeah, that is why I tell all people that i work step by step in that way you can go back to see what is wrong.

112. tiffanymak1996

yeah, i know, that's why i have to be extra careful when i'm doing my exams. And i do tutoring, helps a lot with my presentation skills

113. godorovg

it drives me nuts sometimes on here when I see people skipping around. that is just plain doesn't make sense to me

114. tiffanymak1996

sometimes people skip unintentionally, you know, they calculate in their head, and skipped a few steps, sometimes they don't notice it.

115. godorovg

yes true and may be this is something I will have to deal with, still I can not understand why skip steps what does that prove?

116. tiffanymak1996

i personally think if one is confident with that particular question, and skipping a little steps is alright, just don't skip major ones, step on scrap papers, yes you can skip, but steps in exams, no.

117. tiffanymak1996

i just tell myself be considerate, and help the techer go through the papers as smoothly as possible, work hard for years just to make sure i won't skip anything.

118. godorovg

you just made a fan.

119. tiffanymak1996

u too.:), and thx.

120. godorovg

That is what I try to do here, only that I want the person I am helping to tell what they know and I help from that point

121. godorovg

I don't just do the work for them..

122. tiffanymak1996

yeah, sorry about that , will work hard for that, for me it's kind of harder to explain when not face to face

123. godorovg

yeah, I can how it could be hard for you, but if you want sometime I can give you tips on to do things a little better only if you want tips

124. godorovg

*see

125. tiffanymak1996

yeah, of course, pls do, i'm all ears :)

126. godorovg

okay first what type of math do you help with this mostly?

127. tiffanymak1996

algebra, calculas, and the basics, just high school stuff.

128. godorovg

okay with all these subjects, you need to get the student in which you are helping to tell what they need help with.

129. godorovg

than before you do any of the work have them show you what they know about that problem already and ask to see what they are having trouble with

130. tiffanymak1996

ok

131. godorovg

than once the it is clear, work the problem by typing it out in words and than draw it like you were doing. In the typing step by step always so the student can see what is happening where

132. tiffanymak1996

ok, thx a lot!

133. godorovg

sometimes it won't matter if draw the problem if student doesn't get what is going on. So that is why I type it out in all steps

134. tiffanymak1996

yeah, i find that if students can figure out the problem themselves, it has a greater impression on them

135. godorovg

that is always my goal as well.

136. godorovg

for example this x/7-8=-10 the student wasn't getting it the whole thing that is why I typed out the steps to show that they are making it too hard.

137. godorovg

also to get the student to ask questions as well

138. tiffanymak1996

yeah, interaction helps.

139. godorovg

A must in math, because you and the student have to be involved in order to teach

140. godorovg

also just know you won't be there when they are tested. so have the student do the work and you just guide them

141. godorovg

unless they just not getting it.

142. tiffanymak1996

absolutly right, are you like, a teacher?

143. godorovg

No. I am a Physics Engineering major in college

144. tiffanymak1996

cool, always have love physics, physics rocks!

145. godorovg

yeah, and bio sucks

146. tiffanymak1996

same here!

147. godorovg

Chem and Physics oh yeah,,

148. tiffanymak1996

uh huh

149. godorovg

Bio not on your life

150. godorovg

Anything to do with math I love

151. tiffanymak1996

sry, mom needs me to have lunch, gotta go.

152. godorovg

okay have nice day

153. godorovg

cya latter

154. tiffanymak1996

talk later :)