Question

calcule as questões a seguir
a) 2x + 1 = 10
b ) - x + 5 = 0
c ) 5. ( - 2y -5)=-25

Answer 1

A) 2x+1=10
2x=10-1
2x=9
x=9/2
x=4,5

B)-x+5=0
x=-5

C)5.(-2y-5)=-25
-10y-25=-25
-10y=-25+25
-10y=0
y=-10