Substitute 3x+y=4 5x-y=22

Simultaneous Equations

3x + y = 4

5x - y = 22

The signs of the matching values aren't the same so we add the rest of the equations.

8x = 26

Divide both sides by 8 to get x = 3.25

Now substitute back into the first equation.

(3 x 3.25) + y = 4

9.75 + y = 4

Subtract 9.75 from both sides

y = - 5.75