[latex] left { {{5y-x=-30+4y} atop {3x=21-2y}} ight. \ left { {{5y-(7- frac{2}{3} y)=-30+4y} atop {3x=21-2y}} ight. \ left { {{5y-7+ frac{2}{3}y =-30+4y} atop {3x=21-2y}} ight. \ left { {{5 frac{2}{3} y-4y=-30+7} atop {3x=21-2y}} ight. \ left { {{1 frac{2}{3}y =-23} atop {3x=21-2y}} ight. \ left { {{ frac{5}{3}y =-23 } atop {3x=21-2y}} ight. \ left { {{5y=-69} atop {3x=21-2y}} ight. \ left { {{y=13 frac{4}{5} } atop {3x=21-2y}} ight.[/latex] [latex] left { {{y=13 frac{4}{5} } atop {3x=21-2(13 frac{4}{5})}} ight. \ left { {{y=13 frac{4}{5}} atop {3x=21-27 frac{3}{5} }} ight. \ left { {{y=13 frac{4}{5}} atop {3x=-6 frac{3}{5} }} ight. \ left { {{y=13 frac{4}{5}} atop {x=-2 frac{1}{5} }} ight. [/latex] e)-x-8y=3-5x-y -15+3x+7y=-10-7y 4x-3=7y -5+3x=-14y 8x-6=14y 14y=5-3x 8x-6=5-3x 11x=11 x=1 14y=5-3 14y=2 y=7 x=1 y=7 f) 2x+12+6y=-7+3y -6x-6y-20=22 2x+19=-3y -6y=42+6x 4x+38=-6y -6y=42+6x 4x+38=42+6x -2x=4 x=-2 x=-2 2x+19=-3y x=-2 -4+19=-3y x=-2 15=-3y x=-2 y=-5
