Question

resolva as equações: a) 5(2x-2)=3(2x+6) b)x-2/3 = x+8/5 2) Resolva o sistema:. x+y=10 x-y=60

Answer 1

a)
5(2x-2)=3(2x+6)
10x-10=6x+18
10x-6x=18+10
4x=28
x=28/4
x=7


b)
x-2/3=x+8/5
3x+24=5x-10
3x-5x=-10-24
-2x=-34
x=-34/-2
x=17


2)
X+Y=10
X-Y=60
subtrai o Y
x+x=10+60
2x=70
x=70/2
x=35

X+Y=10
35+y=10
y=10-35
y=-25