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ComicSans10
04.02.2020 •
Mathematics
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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Ответ:
x + 2y = 21
Step-by-step explanation:
Even other options have not been given in this question, But we will prove that equation that combines to form a system of equations is x + 2y = 21
For this we will prove this equation true for x = 3 and y = 9
x + 2y = 21
3 + 2×9 = 21
3 + 18 = 21
21 = 21
Therefore, equation x + 2y = 21 combines to form a system of equations.
Ответ: