Question

resolva as proporções:a) x/4=18/6, b) x-2/x+1=1/2,

Answer 1

a)
x/4 = 18/6
x/4 = 3
x = 3×4
x=12

b)

(x-2)/(x+1) = 1/2
2×(x-2) = (x+1)
2x - 4 = x+1
2x-x = 1 + 4
x = 5