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I need these three solved. I have a lot of math to do. the directions say solve each system of equations using substitution. show mathematical work for each to justify your response.

I need these three solved I have a lot of math to do the directions say solve each system of equations using substitution show mathematical work for each to jus class=

Respuesta :

mathecoach

Answer:

5.

x + 2(x + 1) = 8 --> x = 2

y = 2 + 1 = 3

7.

3(9 + 2y) + 5y = 20 --> y = -7/11

x = 9 + 2(-7/11) = 85/11

9.

3(-1 - 2y) + 5y = -1 --> y = -2

x = -1 - 2(-2) = 3


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