anonymous
  • anonymous
would an equation of a line with a slope of 4 and a y-intercept of (o,2) be y=4x+2?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
yup
anonymous
  • anonymous
one last question for you, youve been such a big help
anonymous
  • anonymous
whats the equation of a line with a slope of 3/7 and contains the point (3,8)

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anonymous
  • anonymous
okay back to the line equation y = mx + b given slope so plug it in y = (3/7)x + b now plug in the points 8 = (3/7)3 + b b = 8 - 9/7 = 47/7 so y = (3/7)x + 47/7
anonymous
  • anonymous
find the equation of a line that contains the points (3,7) and (12, -4)
anonymous
  • anonymous
lols you said last question try this one, i'll walk you through it what do you have to do first?
anonymous
  • anonymous
y=mx+b form?
anonymous
  • anonymous
wait, find the slope first
anonymous
  • anonymous
which would be -11/9
anonymous
  • anonymous
yup to both how do you find the slope of two points
anonymous
  • anonymous
you got it
anonymous
  • anonymous
now you have the formula y = mx + b and you have the slope and two points, now what?
anonymous
  • anonymous
so as of right now the equation is y=-11/9x+b. you put in the two points in the equation?
anonymous
  • anonymous
since both points are on the line you can choose either ONE pick one to put into the equation it doens't matter which one you use, you'll get the same answer
anonymous
  • anonymous
so i could have 7=(-11/9)(3)+b?
anonymous
  • anonymous
yup
anonymous
  • anonymous
and then you solve for b?
anonymous
  • anonymous
you got it
anonymous
  • anonymous
can you walk me through solving b one more time?
anonymous
  • anonymous
sure you have 7=(-11/9)(3)+b multiply the fraction 7 = -11/3 + b add -11/3 on both sides b = 7 + 11/3 add b = 32/3
anonymous
  • anonymous
when i multiplied the fraction i got -3.66. how did you get 11/3?
anonymous
  • anonymous
nevermind. thats the fraction of -3.66
anonymous
  • anonymous
lols you're using a calculator? -3.66 is the same as -11/3 put that into your calculator
anonymous
  • anonymous
yup
anonymous
  • anonymous
so final equation should be y=-11/3+32/3?
anonymous
  • anonymous
you forgot an x y=(-11/3)x+32/3 ^-- here
anonymous
  • anonymous
okay thank you!
anonymous
  • anonymous
cheers ^_^

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