A certain positive number is multiplied by 4, and then the result is subtracted from the original number. The result is 21 less
than 0. What is the number?
2 answers:
Answer:
The answer is 7
Step-by-step explanation:
Let the positive number x
Then multiply by 4 : 4x
Subtracted by the number which is x-4x
Then we have x-4x=-21
: -3x=-21
X= -21/-3
X= 7
Answer:
The number is 7
Step-by-step explanation:
certain positive number: x
x is multipled by 4:
4x
result of this is subtracted from the original number:
so original number minus 4x,
x - 4x
the result is 21 less than 0, this means negative 21
x - 4x = 0 - 21 = -21
do algebra:
-3x = -21
multiply both sides by -1
3x = 21
divide both sides by 3
x=7
(certain positive number: x) is equal to 7
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Step-by-step explanation:
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