Help pls! (it's a pic)

Choice C

x+y = 28

3x+4y = 100

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Explanation:

x and y are placeholders for nonnegative whole numbers.

Specifically,

x = number of three point questions

y = number of four point questions

Since we have 28 questions total, this must mean x+y = 28. That forms the first equation in our system of equations.

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Now let's form the second equation:

x = number of three point questions

3x = points we get from all the three point questions

y = number of four point questions

4y = points we get from all the four point questions

3x+4y = all points possible

3x+4y = 100  is the second equation

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So we have this system

which fits the conditions in the instructions.

step-by-step explanation:

20

step-by-step explanation: