When I subsitute 5x+3 into the equation I get x=1/5 and y=2 is this correct?
Try plugging in your final values for x and y into both of the original equations.
If and only if the equations are true, then your answers are correct.
Try plugging in your final values for x and y into both of the original equations.
If and only if the equations are true, then your answers are correct.