SOLUTION: Use the graph to find the equation of the line. Put the answer in y = mx + b form. The coordinates in the graph are (4, 1500) and (8, 3900)

Algebra ->  Linear-equations -> SOLUTION: Use the graph to find the equation of the line. Put the answer in y = mx + b form. The coordinates in the graph are (4, 1500) and (8, 3900)      Log On


   

Question 1136241: Use the graph to find the equation of the line. Put the answer in y = mx + b form.
The coordinates in the graph are (4, 1500) and (8, 3900)
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

y+=+mx+%2B+b+
The coordinates in the graph are (4, 1500) and (8, 3900)
use given coordinates to calculate slope m
m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29
m=%283900-1500%29%2F%288-4%29
m=2400%2F4
m=600

so far we have
y+=+600x+%2B+b+........use one poine to calculate b

1500+=+600%2A4+%2B+b+
b=1500+-+600%2A4++
b=1500+-+2400++
b=-900+

and, your equation is: y+=+600x+-900+