SOLUTION: I am doing graphing linear functions and my teacher told me to make the equation by using (4,6) (-1,2) and I have no idea how to do it.... HELP!!!!

Algebra ->  Linear-equations -> SOLUTION: I am doing graphing linear functions and my teacher told me to make the equation by using (4,6) (-1,2) and I have no idea how to do it.... HELP!!!!      Log On


   

Question 653668: I am doing graphing linear functions and my teacher told me to make the equation by using (4,6) (-1,2) and I have no idea how to do it.... HELP!!!!
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

Solved by pluggable solver: FIND EQUATION of straight line given 2 points
hahaWe are trying to find equation of form y=ax+b, where a is slope, and b is intercept, which passes through points (x1, y1) = (4, 6) and (x2, y2) = (-1, 2).
Slope a is a+=+%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29+=+%282-6%29%2F%28-1-4%29+=+0.8.
Intercept is found from equation a%2Ax%5B1%5D%2Bb+=+y%5B1%5D, or 0.8%2A4+%2Bb+=+2.8. From that,
intercept b is b=y%5B1%5D-a%2Ax%5B1%5D, or b=6-0.8%2A4+=+2.8.

y=(0.8)x + (2.8)

Your graph: