Question

2x + y = 3

x - 2y = -1

If equation one is multiplied by 2 and then the equations are added, the result is _____.


3x = 2
3x = 5
5x = 5

Answer 1

5x=5

Explanation:

Answer 2

multiply 2x+y = 3 by 2

4x + 2y = 6

x - 2y = -1

add terms (be careful about signs!)

5x + 0 = 2

5x = 5