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20-06-2017
Mathematics

contestada

Solve the system by substitution.

y = 2x
3x + 2y = 21

Respuesta :

20-06-2017

y=2x
3x+2y=21
3x+2(2x)=21
3x+4x=21
7x=21
x=3
y=2(3)
y=6

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