3) X-y= 11
2x + y = 19

x = 10, y = -1

Step-by-step explanation:

x - y = 11 . . . . . . . eq 1

2x + y = 19 . . . . . . eq 2

Substitute eq 1 into eq 2.

Hence eq 1 = x = 11 + y

Substituting into eq 2 will give you;

2(11 +y) + y = 19

22 +2y + y = 19

3y = 19 - 22

3y = -3

y = -1

Substitute y into eq 1 to get x

that is x - (-1) = 11

          x = 11 - 1

         x = 10

the answer is c)8

step-by-step explanaction: