2x-45=y,2y-21=x solve using substituiton method
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Step-by-step explanation:
2x-45 = y
Multiply by 2 both aides
2 (2x-45) = 2y
4x-90=2y
Substract 21 from both sides
4x-90-21=2y - 21
4x - 111 = 2y -21
x = 2y-21
4x - 111 = x
4x - x = 111
3x = 111
x = 111/3
x = 37
x= 2y - 21
37 = 2y -21
37+21 = 2y
2y = 58
y=58/2
y=29
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