Solve for x and y:
X + y = 40
-x + y = -20
A) x = 30; y = 10
B) x = - 10; y = 30
C) x = - 30; y = - 10
D) x = - 60; y = 20
E) x = - 60; y = - 20

Question

Quizplus · Accepted Answer

First we can add the two equations together:

X + y = 40
-x + y = -20
___________
0 + 2y = 20

Simplifying, we get y=10. Then we can substitute y=10 into one of the original equations to solve for x:

x+10=40
x=30

Thus, the solution is x=30 and y=10, which corresponds to choice A.

Solve for X and Y