Question

resolva as equações. "4x+12=x-3". b) 7y-20=2y. c) 4z-1=2z+6

Answer 1

4x+12=x-3
4x-x=-3-12
3x=-15
x=-15/3
x=-5

7y-20=2y
7y-2y=20
5y=20
y=20/5
y=4

4z-1=2z+6
4z-2z=6+1
2z=7
z=7/2

Answer 2

Boa noite!!!

$4x + 12 = \times - 3 \\ 4x - x = - 3 - 12 \\ 3x = - 15 \\ x = \frac{ - 15}{3} \\ x = - 5 \\ \\ b)7y - 20 = 2y \\ 7y - 2y = 20 \\ 5y = 20 \\ x = \frac{20}{5} \\ x = 4 \\ \\ c)4z - 1 = 2z + 6 \\ 4z - 2z = 6 + 1 \\ 2z = 7 \\ z = \frac{7}{2} ou 3,5$

Espero ter ajudado!