4x - y equals 1 3x plus y equals 13?

4x - y = 1

3x + y = 13

Simultaneous Equations.

Add ; This will eliminate 'y'

Hence

7x = 14

x = 2

When x = 2

3(2) + y = 13

6 + y = 13

y = 13 - 6

y = 7

Hence the solution in ( x,y) form is ( 2, 7).