This basically means, solve the system of equations for x and y....you CAN do it graphically
2x+3y=7 Multiply by -3 ==> -6x - 9y = -21
3x+4y= -8 Multiply by 2 ==> 6x + 8y = -16 See what I did there? Now add the two equations together and the 'x' part disappears
-y = - 37 y = 37 now sub this value of y into oneof the equations to find the 'x' value and you're done.