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Betty's grade in science class is affected by the number of missing assignments. The table below shows the science grade percentage for a given number of missing assignments.
Number of missing assignments: 3,5,7,9
Science grade%: 80,70,60,50
The equation for the given table is y=-5x+95. If Betty is missing 15 assignments, what's the [percentage of her grade in science class?

What is the rate of change?

Answer :

Azailia

Hi!

[tex]y=-5x+95[/tex]

Plug in [tex]15[/tex] for [tex]x[/tex]

[tex]y=-5(15)+95[/tex]

Multiply [tex]-5[/tex] and [tex]15[/tex]

[tex]y=-75+95[/tex]

Add [tex]-75[/tex] and [tex]95[/tex]

[tex]y =15[/tex]

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Betty's percentage is 15%.

The rate of change is the amount it changes for every missing assignment, therefore it would be -5.

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