X-y=3

7x-y=-3

What is the answer?

x=-1, y=-4

Step-by-step explanation:

x-y=3 ... (1)

7x-y=-3 ... (2)

From (1) make x the subject of formula by adding y to both sides

x=3+y ... (3)

Substitute (3) into (2)

7 (3+y) - y=-3

Open the bracket

21+7y-y=-3

21+6y=-3

Substrate 21 from both sides

6y=-24

Divide both sides by 6

y=-4

Substitute the value of y into (3)

x=3-4

x=-1

Therefore x is-1 and y is - 4

x is-1 and y is - 4