Question

Can you help me with this problems

Answer 1

To find y = mx + b you need to determine the slope. To find slope use the formula
m = y2 - y1 / x2 - x1

Use two points on the graph such as (4, 100) and (12, 300)

Now plug it into the formula

m = 300 - 100 / 12 - 4

m = 200 / 8

m = 25

Now we know the slope, but we need to find the y-intercept.

y = mx + b

y = 25x + b

Substitute one of the points (4, 100) as the y value and x value to find b, the y intercept

100 = 25(4) + b

100 = 100+ b

100 - 100 = b

0 = b

Now plug in your formula

Y = 25x + 0

y = 25x