As retas r e s são paralelas . calcule o valor de x e y em cad...

a) 2x-50=7x-25 b)x+20=3x-100 x+20+y-35=180

2x-7x=-25+50 x-3x=-100-20 x+y=180-20+35

-5x=-25 (x-1) -2x=-120 (x-1) x+y=195

5x=25 x=120/2 60+y=195

x=25/5 x=60 y=135

x=5

c)3x-90=x+20 4y-45=2y+15 d)3y=2x+y

3x-x=20+90 4y-2y=15+45 3y-y=2x

2x=110 2y=60 2y=2x

x=55 y=30 y=x