Question

1) Resolver as equações: a) + 5 = 8 b) − 4 = 3 c) + 6 = 5 d) − 7 = −7 e) + 9 = −1 f) − 39 = −79 g)10 = + 8 h) + 20 = 15 i) – 10 = 4 j)7 = + 8 k) − 1 = 5 l)2 + 4 = 16 m)3 = 15 n)2 = 10 o)3 = −9

Answer 1

a) x+5=8x+5=8

x=8-5x=8−5

x=3x=3

b) x-4=3x−4=3

x=3+4x=3+4

x=7x=7

c) x+6=5x+6=5

x=5-6x=5−6

x=-1x=−1

d) x-7=-7x−7=−7

x=-7+7x=−7+7

x=0x=0

e) x+9=-1x+9=−1

x=-1-9x=−1−9

x=-10x=−10

f) x+28=11x+28=11

x=11-28x=11−28

x=-17x=−17

g) x-109=5x−109=5

x=5+109x=5+109

x=114x=114

h) x-39=-79x−39=−79

x=-79+39x=−79+39

x=-40x=−40

i) 10=x+810=x+8

10-8=x10−8=x

2=x2=x

j) 15=x+2015=x+20

15-20=x15−20=x

-5=x−5=x

k) 4=x-104=x−10

4+10=x4+10=x

14=x14=x

l) 7=x+87=x+8

7-8=x7−8=x

-1=x−1=x

m) 0=x+120=x+12

0-12=x0−12=x

-12=x−12=x

n) -3=x+10−3=x+10

-3-10=x−3−10=x

-13=x−13=x