first solve the first equation for 'y' 3x - y = 4 subtract 3x from both sides -y = -3x + 4 divide both sides by -1 y = 3x - 4 Now take this equation and substitute into the second equation:
5x + 3y = 9 5x + 3(3x - 4) = 9 5x + 9x - 12 = 9 14x - 12 = 9 14x = 9 + 12 14x = 21 x = [tex] \frac{21}{14} = \frac{3}{2} [/tex] or 1.5 Now substitute this value for 'x' into either of the first two equations to find 'y' I'll use the equation y = 3x - 4 y = 3(1.5) - 4 y = 0.5
