Question

Valor da incógnita de:
a- x+5: 18
b- 3+y: 12
c- 4z: 12
d- y+9: y+2y
e- 2m: -4
obs- '' : '' significa igual

Answer 1

a)
x + 5 = 18
x = 18 - 5
x = 13
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
3 + y = 12
y = 12 - 3
y = 9
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
4z = 12
z = 12/4
z = 3
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d)
y + 9 = y + 2y
y + 9 = 3y
9 = 3y - y
9 = 2y
2y = 9
y = 9/2

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
e)

 2m = - 4
m = - 4/2
m = - 2
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