Question

Which function can be used to find y, total amount saved in, x weeks

Answer 1

Input data

Points

A = (0, 50)

B = (30,110)

First of all, remember what the equation of a line is:

y = mx+b

Where:

m is the slope, and

b is the y-intercept

`\begin{gathered} m=(110-50)/(30-0) \\ m=(60)/(30) \\ m=2 \end{gathered}`

Now, what about b, the y-intercept?

`\begin{gathered} b=y-mx \\ b=50-2\cdot0 \\ b=50 \end{gathered}`

The equation of the line that passes through the points

`y=2x+50`