Question

Use the matrix to solve the system of equations

5x-4y=28
7x+5y=18

Answer 1

Okay so I wont be able to show the row here but I will try my best.

7(5x-4y=28) = 35x-28y=196

-5(7x+5y=18) = -35x-25y=-90

= -53y=106

= y=-2

5x-4(-2) =28

5x+8=28

5x=20

x=4