Step-by-step explanation:
x+4y (1)
x-4y (2)
(1)+(2):
(x+4y)+(x-4y) = 22+(-18)
x+4y+x-4y = 22-18
2x = 4
x = 2
therefore, there is only one solution for the systems of equations
Answer:
(2,5)
Same as last problem:
x + 4y = 22
x = 22 - 4y
22 - 4y - 4y = -18
-8y = -40
y = 5
x + 4(5) = 22
x + 20 = 22
