Question

9.
Resolva as equações de 1° grau.
a)5X - 20 = 80 + 8X

b)100X = 900 - 120X

c)500 = 6X + 20

d)70 + 10X = 800

e)30X + 90X = 1800 - 40X​

Answer 1

Explicação passo-a-passo:

a) 5x - 20 = 80 + 8x -> 5x-8x = 80 +20-> -3x=100

x= -100/3

b) 100x=900-120x -> 100x+120x=900 ->220x=900

-> x=900/220

c) 500 = 6x +20 -> 6x=500-20 -> x=480/6 -> x=80

d) 70+10x=800 -> 10x=800-70 -> x=730/10 -> x=73

e)30x+90x=1800-40x -> 120x + 40x=1800 ->

160x=1800 -> x=1800/160 -> x= 11,25