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

x + 2y = 21

(50 Points) Which equation combines with the given equation to form a system of equations-example-1
User Unomi
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2 Answers

1 vote
C
If you plug in the values in that equation, it works.
User Carlos J
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To find the other system, since we know already that x = 3 and y = 9, we just have to input the value of x and y in each of the equations and see if they work.

4x + 6y = 64

4 (3) + 6(9) = 64

12 + 54 = 64
66 = 64

That doesn't work, so we move on.

2x + y = 36

2 (3) + 9 = 36

6 + 9 = 36

15 = 36

Once again, we move on.

4x + y = 21

4 (3) + 9 = 21

12 + 9 = 21

21 = 21

Since we're only looking for one answer, we have found it, meaning that the answer to this question is 4x + y = 21.
User Sebastien Horin
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