Question

Which shows the result of a correct substitution for the system y=2x+3 and 3x+2y=9?

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A. y= 2y + 3

B. 3(2x + 3) + 2y = 9

C. 3x + 2(2x + 3) = 9

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D. 2x + 2y = 3

Answer 1

C. 3x + 2(2x + 3) = 9

Explanation:

We are given the following relation:

y = 2x + 3

And we want to substitute into:

3x + 2y = 9.

So

`3x + 2(2x + 3) = 9`

Which is given by option C.