Question

Comparing Methods to solving systems.

x -y =-2
7x +2y =-5

Solve it by graphing method

Answer 1

`x = - 1 \\ y = 1`

Explanation:

`x - y = - 2`

`x = y - 2`

`7x + 2y = - 5`

`7(y - 2) + 2y = - 5 \\`

`7y - 14 + 2y = - 5`

`9y = 14 - 5`

`9y = 9`

`y = (9)/(9) = 1`

`x = y - 2 = 1 - 2 = - 1`