Respuesta :
The value of the number is 43.
What is linear equation in one variable?
The linear equations in one variable is an equation which is expressed in the form of ax+b = 0, where a and b are two integers, and x is a variable and has only one solution.
What is the subtraction property of equality?
The subtraction property of equality states that when the same number is subtracted from both sides of an equality , then two sides of the equation still remain equal.
Let the number be x.
According to the given question.
The sum of the number and 21 is sixty-four.
⇒ x + 21 = 64
Now, we have a linear equation in one variable.
So, to find the value of the number we have to solve the linear equation in one variable.
Therefore,
x + 21 = 64
⇒ x + 21 - 21 = 64 -21 ( subtraction property of equality)
⇒ x = 43
Hence, the value of the number is 43.
Find out more information about linear equation in one variable and subtraction property of equality here:
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