Como
4x + 3 [ 15 - x ] = 38
x + 45 = 38
x = - 7
DWRead
4x + 3y = 38
substitute -x+15 for the y
4x + 3(-x+15) = 38
4x - 3x + 45 = 38
x = -7
Miss
To find the y solution, all you have to do is to substitute x = -7 in any of the equations you choose for e.g
Subsituting x = -7 in the first equation will be
y = -(-7) + 15 Note that minus times minus equals plus
y = +7+15
y = 22