Question

What is the solution to this system of linear equations:
y-x=4 and y+2x=1

Answer 1

-x + y = 4
2x + y = 1
-3x = 3
-3 -3
x = -1
-x + y = 4
-(-1) + y = 4
1 + y = 4
- 1 - 1
y = 3
(x, y) = (-1, 3)