Question

2x + y = 3

x - 2y = -1



If equation two is multiplied by -2 and then the equations are added, the result is


3y = 5

5y = 5

-3y = 3

Answer 1

9514 1404 393

Answer:

5y = 5

Explanation:

-2(x -2y) +(2x +y) = -2(-1) +(3) . . . . -2 times [eq2] + [eq1]

-2x +4y +2x +y = 2 +3 . . . . eliminate parentheses

5y = 5 . . . . . . . . collect terms