Question

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Answer 1

y= 85x i hope this helps you :)

Answer 2

Answer:
`y = 85x`

Explanation:

The function
`y = ax+b` has the rate of change
`a`.

It's easy to see that the points
`(0, 0)` and
`(4, 300)` belong to the graph.

Solve this system of equations:

`\left \{ {{0=0a+b} \atop {300=4x+b}} \right.`

`\left \{ {{a=75} \atop {b=0}} \right.`

The rate of change of the graph is
`a = 75`.

Only
`y=85x` has higher rate of change in the answer section.