3) x-y = 3

| 7x-y=-3

Y=2.37

Step-by-step explanation;

Make the top equation solve for x, x=3-y

subsitute (x=3-y) into 7x-y=-3

Get 7 (3-y) - y=-3

use the distributive property and get 21-7y-y=-3

Combine like terms 21-8y=-3

Subtract 21 on both sides, - 8y=-19

Divide by - 8 on both sides

y=2.37