(50 Points) Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9? x + 2y = 21

asked Jun 6, 2021 60.9k views

5 votes

(50 Points)

Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9?
x + 2y = 21

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3 votes

x + 2y = 21
3 + 2(9) = 21
3 + 18 = 21
So I think the equation is 3 + 2(9) = 21

ATC answered Jun 7, 2021

by ATC

7.6k points

5 votes

Answer:

It's option C.

Explanation:

It's right on edmentum. Also just use substitution. Not that hard.

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