Question

The graph below shows the price, y, in dollars, of different amounts of granola, x, in pounds:

Which equation best represents the relationship between x and y?

A.y = 8x
B.y = x + 4
C.y = 4x
D.y = x + 8

Answer 1

step 1
find two points in the graph
let
A (0,0)
B (2,8)

step 2
find the slope m
m=(y2-y1)/(x2-x1)----> m=(8-0)/(2-0)----> m=8/2----> m=4

step 3
with m=4 and point A (0,0) find the equation of the line
y-y1=m*(x-x1)-----> y-0=4*(x-0)----> y=4x

the answer is
y=4x