Question

Calcule as equações de primeiro grau.

a) x-10=60-4x
b) 10x+5=260
c) 6x=-120
d) 3x+10=70-3x
e) 90x-100

Answer 1

A)x-10=60-4x

x-10+10=6010-4x

x=70-4x

x+4x=70-4x+4x

5x=70

$\frac{5x}{5}$=$\frac{70}{5}$

x=14

B)10x+5=260

10x=255

x=25,5

C)6x=-120

x=-20

D)3x+10=70-3x

6x=60

x=10

E)90x-100=10(9x-10)