This is algebra 1 i need help anybody understand?

d. x = 3, y = 4

Step-by-step explanation:

Well in the following system of equations,

We need to single out x or y in either equations,

let's do the first one for x.

x - y = -1

+y to both sides

x = y - 1

Now we plug in y - 1 for x in x + 2y = 11

(y - 1) + 2y = 11

Combine like terms

3y - 1 = 11

+1

3y = 12

Divide 3 by both sides

y = 4

Now we plug in 4 for y in x - y = -1

x - 4 = -1

+4 to both sides

x = 3

(3,4)

Thus,

the answer is d. x = 3, y = 4.

Hope this helps :)