Question

dadas as equaçoes abaixo responda pfv
a) 3y + 7 = 15
b) x - 17 = -9
c) x + 4 . (x - 1) = 9 - 2x + 3
d) 2x + 14 = 5x - 1

Answer 1

a)
3y + 7 = 15
3y = 15 - 7
3y = 8
y = 8/3

b) 
x - 17 = -9
x = -9 + 17
x = 8

c)
x + 4.(x - 1) = 9 - 2x + 3
x + 4x - 4 = 9 - 2x + 3
x + 4x + 2x = 9 + 3 + 4
7x = 16
x = 16/7

d)
2x + 14 = 5x - 1
-3x = -15
x = -15/-3
x = 5