Question

alguém consegue resolver?

a)10y=10x+30
   x+2y=3

b)y+x=-1
       2  3

Answer 1

a) x----> 3-2y

10y= 10x+30
10y= 10(3-2y) +30
10y= 30 -20y +30
10y +20y= 30+30
30y= 60
y= 60/30
y=2

x= 3-2y
x= 3-2(2)
x= 3-4
x= -1