Question

How do i solve each system for these equations

x-y=4 2x+y=5

Answer 1

x = 3

y = -1

Explanation:

x-y=4 [1]

2x+y=5 [2]

rearrange [1] and label it [3]

x = 4 + y [3]

substitute [3] into [2]

2(4 + y) + y = 5

8 + 3y = 5

3y = -3

y = -1

substitute y = -1 into [1]

x - (-1) = 4

x = 3