SOLUTION: What is the y intercept of these linear functions unde the x column is -5 , and 3 under the y Column is -4 , and 8

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Question 1080042: What is the y intercept of these linear functions unde the x column is -5 , and 3 under the y Column is -4 , and 8
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

given:
x ---..y
-5 --..-4
3---..8
use these points to find a slope
m=%288-%28-4%29%29%2F%283-%28-5%29%29
m=%288%2B4%29%2F%283%2B5%29
m=12%2F8
m=3%2F2
so far, equation is:
y=%283%2F2%29x%2Bb
use coordinates of one point to find y-intercept b
8=%283%2F2%293%2Bb
8-9%2F2=b
16%2F2-9%2F2=b
b=7%2F2
equation is:
y=%283%2F2%29x%2B7%2F2 and y-intercept b=7%2F2=3.5

+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+%283%2F2%29x%2B7%2F2%29+