Question

3) Verifique se o núme
a) x + 15 = 18
b) 20 - 4x = 8
C) 2x + 5 = -1​

Answer 1

a) x+15=18

x=18-15

x=3

________

b) 20 - 4x = 8

-4x=8-20

-4x=-12

x=-12/-4

x=3

________

C) 2x + 5 = -1

2x=-1-5

2x=-6

x= -6/2

x= -3