Question

resolva as equações abaixo:
a x-9=9
b 4×-9=1-2×
c ×+5=20-4×
d 9×-4× + 10=7×-30 ​

Answer 1

Explicação passo-a-passo:

a) x-9=9

x = 9+9

x = 18

b) 4×-9=1-2×

4x +2x = 1+10

6x = 10

$x = \frac{10}{6}$

c) ×+5=20-4×

x +4x = 20-5

5x = 15

$x = \frac{15}{5}$

x = 3

d) 9×-4× + 10=7×-30

9x -4x -7x = -30 -10

5x - 7x = -40

-2x = -40 .(-)

2x = 40

$x = \frac{40}{2}$

x = 20