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09-03-2024
Mathematics

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using substitution to solve systems y-2x=3 2x-3y=21

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peacemonk peacemonk

09-03-2024

Substitute on the first equation: y = 3 + 2x
2x - 3(3 + 2x) = 21
2x - 9 - 6x = 21
-4x = 21 + 9
x = 30 /4
x = 7.5

Then, substitute again: y = 3 + 2•7.5 = 18

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