anonymous
  • anonymous
Please help me I don't understand?? study guide :(
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
what are the coordinates of the x- intercept of the line 3x4y=12
anonymous
  • anonymous
I know what the answer is (4,0) but why?
hartnn
  • hartnn
to get x-intercept, put y=0 in line 3x+4y=12

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jim_thompson5910
  • jim_thompson5910
like hartnn is saying 3x+4y=12 3x+4(0)=12 ... plug in y = 0 3x + 0 = 12 3x = 12 x = 12/3 x = 4 So the x-intercept is the point (4,0)
jim_thompson5910
  • jim_thompson5910
to find the y-intercept, just plug in x = 0 and solve for y
anonymous
  • anonymous
Thank you Thank you for your help :)
jim_thompson5910
  • jim_thompson5910
yw
anonymous
  • anonymous
do you mind giving me a practice problem? So I can figure it out myself i really appreciate it
jim_thompson5910
  • jim_thompson5910
find the y-intercept of 5x + 10y = 30
anonymous
  • anonymous
just make up one please :)
hartnn
  • hartnn
to get y-intercept, put x=0 in 5x+10y=30
anonymous
  • anonymous
since my test is multiple choice can you give me answers to choose from?
hartnn
  • hartnn
not required, but sure, 1) (0,-3) 2) (0,3) 3) (3,0) 4) (0,6)
hartnn
  • hartnn
having problems ?
anonymous
  • anonymous
yes i got x=10?
anonymous
  • anonymous
I suck at math
hartnn
  • hartnn
how you can get x=10 when i told you to put x=0 to find y-intercept :O
anonymous
  • anonymous
i have no idea why
anonymous
  • anonymous
one sec
hartnn
  • hartnn
|dw:1362727211824:dw|
hartnn
  • hartnn
can you find y from 5(0)+10y=30 ?
anonymous
  • anonymous
sorry i got it though it would be (3,0) yes
hartnn
  • hartnn
you got y=3 then, right ?? and intercepts are of the form (x,y) y co-ordinate comes after comma so, would you like to revise your answer ?
anonymous
  • anonymous
yes its (0,3)
hartnn
  • hartnn
now its correct :)
hartnn
  • hartnn
want more examples?
anonymous
  • anonymous
yes please and thank thank you for helping me :)
anonymous
  • anonymous
I actually understand it now!!
hartnn
  • hartnn
oh, you are welcome :) find x intercept of the line 2x+3y = 7 this involves fraction....
hartnn
  • hartnn
try first without choices
anonymous
  • anonymous
okay ill try it :)
anonymous
  • anonymous
okay i know this is wrong but is it (0, 2 1/3)
jim_thompson5910
  • jim_thompson5910
to find the x-intercept, you plug in y = 0 not x = 0
hartnn
  • hartnn
to get x-intercept, you need to put y=0, right ?
anonymous
  • anonymous
oh wow okay one sec sorry its late
hartnn
  • hartnn
no problem, take your time :)
anonymous
  • anonymous
alright is it (0, 3 1/2) btw thanks for your patience math is just really not my subject :/
jim_thompson5910
  • jim_thompson5910
2x+3y = 7 2x+3(0) = 7 ... plug in y = 0 (not x = 0) 2x + 0 = 7 2x = 7 x = ???
hartnn
  • hartnn
x=3 1/2 is correct, but same note again, intercepts are of the form (x,y) x co-ordinate comes before comma so, would you like to revise your answer ?
anonymous
  • anonymous
No way i got it right and yes :) (3 1/2,0)
hartnn
  • hartnn
yes, now (3 1/2,0) is correct :)
anonymous
  • anonymous
Thanks again for all your help Im going to go to sleep so i can get up tomorrow again i cant thank you enough you really helped me understand this I know I will ace that test now Thank you!! :)
hartnn
  • hartnn
i am glad to hear that :) and you are most welcome ^_^

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