Question

COMPROBACIONES
a) 20x = 40
b) - 12z = 36
c)15y = - 45
d) k=-
e) 3y + 10 = 22
f) -5m - 7 = - 42
g) + 3 = 8
h) 9x -14 = 13
i) -2x + 6 = -2
j) 8y + 2.5 = 10.5​

Answer 1

Respuesta:

A) 20x = 40

$20x = 40\\\\x= \frac{40}{20} \\\\x= 2\\\\Comprobacion\\20(2)=40\\40=40$

B) - 12z = 36

$- 12z = 36\\\\z=\frac{36}{-12}\\\\z=-3\\\\Comprobacion\\- 12(-3) = 36\\36=36$

C) 15y = - 45

$15y = - 45\\\\y=\frac{-45}{15} \\\\y=-3\\\\Comprobacion\\15(-3) = - 45\\-45=-45$

D) No esta bien corrijela k=-

E) 3y + 10 = 22

$3y + 10 = 22\\\\3y=22-10\\\\3y=12\\\\y=\frac{12}{3}\\\\y=4\\\\Comprobacion\\ 3(4) + 10 = 22\\22=22$

F) -5m - 7 = - 42

$-5m - 7 = - 42\\\\-5m=-42+7\\\\-5m=-35\\\\m=\frac{-35}{-5} \\\\m=7\\\\Comprobacion\\-5(7) - 7 = - 42\\42=42$

G) Creo que también te falto algo correjila + 3 = 8

H) 9x -14 = 13

$9x -14 = 13\\\\9x=13+14\\\\9x=27\\\\x=\frac{27}{9}\\\\x=3\\\\Comprobacion\\9(3) -14 = 13\\13=13$

I) -2x + 6 = -2

$-2x + 6 = -2\\\\-2x=-2-6\\\\-2x=-8\\\\x=\frac{-8}{-2} \\\\x=4\\\\Comprobacion\\-2(4) + 6 = -2\\-2=-2$

J) 8y + 2.5 = 10.5​

$8y + 2.5 = 10.5\\\\8y=10.5-2.5\\\\8y=8\\\\y=\frac{8}{8} \\\\y=1\\\\Comprobacion\\8(1) + 2.5 = 10.5\\10.5=10.5$