Answer:
(-9, 5)
Step-by-step explanation:
there are 2 variable: x and y
eliminate one of the variables for example y
-x - y = 4
-2x - y = 13 multiply this equation by (-1)
-x - y = 4
2x + y = -13
add both equations
2x-x-y+y = 4-13
x = -9
substitute x = -9 in the first equation
-(-9)-y = 4
9 - y = 4 subtract 9 from both sides
-y = 4 - 9
-y = -5 multiply by (-1)
y = 5
