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77julia77 [94]
3 years ago
9

Solve the systems using substitution. − 2x − 5y = − 5 x = 5y − 20

Mathematics
1 answer:
Law Incorporation [45]3 years ago
7 0
-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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