Question

-x+2y=6 and 3x-y=-9 solve by substitution method​

Answer 1

Answer:

x=-12/5

y=9/5

Step-by-step explanation:

solve eq 1st and find x= 2y-6 (this is eq 3rd)

put the value of x in eq 2nd

3(2y-6)-y=-9

6y-18-y=-9

5y-18=-9

5y=18-9

5y=9

y=9/5

put the value of y in eq 3rd

x= -12/5

Answer 2

Step-by-step explanation:

(-x+2y=6)-3= 3x-6y=-18

3x-y=-9

- + +

0-5y=-9

Y=9/5

3x-6*9/5=-18

3x=-18+54/5=-90+54=34/5

X=34/5*3= 102/5