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18-12-2020
Mathematics

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Solve the systems using substitution.

− 2x − 5y = − 5
x = 5y − 20

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meowmeow223334 meowmeow223334

18-12-2020

-2(5y-20) - 5y = -5
-10y + 40 - 5y = -5
-15y + 40 = -5
-15y = -45, y = 3
x = 5(3) - 20
x = 15 - 20, x = -5
Solution: x = -5, y = 3... or (-5,3)

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