Question

How to solve in substitution method

(i) -3x+y=6
x+2y=-21

Answer 1

Step-by-step explanation:

you should have to do it by your own it will be help to you in future

Answer 2

Answer:

Step-by-step explanation:

-3x+y=6---(1)

x+2y=-21--(2)

-3x-6=-y

y=3x+6--(3)

substitute (3) in (2)

x+2(3x+6)=-21

x+6x+12=-21

7x=-33

x=-33/7

now put x value in (3)

y=3(-33/7)+6

=-99/7+6

=-99+42/7

=-57/7