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Use substitution to solve the following system of equations. What is the value of y?
3x + 2y = 12
5x - y = 7

Use substitution to solve the following system of equations What is the value of y 3x 2y 12 5x y 7 class=

Respuesta :

Answer:

3

Step-by-step explanation:

3x+2y=12

5x-7=y

3x+2(5x-7)=12

3x+10x-14=12

13x=12+14

13x=26

x=2

3(2)+2y=12

6+2y=12

2y=12-6

y=6/2

y=3

jisookim27

Answer:

3x+2y=12

or,3x=12-2y

or,x=12-2y/3

5x-y=7

5×12-2y-y/3=7

60-y/3=7

60-y=7×3

60=21+y

60-21=y

y=39

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