Question

método de sustitución
3x-y=7
2x+3y=12​

Answer 1

Explicación paso a paso:

3x-y=7

2x+3y=12

3x-y=7

3x=7+y

x= 7+y.

3

2x+3y= 12

2(7+y ) +3y= 12

3

14+2y + 3y =12

3

14+2y =12-3y

3

14+2y= 3(12-3y)

14+2y= 36-9y

2y+9y=36-14

11y= 22

y= 22/11

y= 2

3x-y= 7

3x-2=7

3x= 7+2

x= 9/3

x= 3