Test Solving for Variable

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What is a variable in mathematics?

Back

A variable is a symbol, often a letter, that represents a number in mathematical expressions or equations.

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What does it mean to solve for a variable?

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To solve for a variable means to find the value of that variable that makes the equation true.

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What is the first step in solving the equation 15 + 4a - 6 = 21?

Back

Combine like terms: 4a + 9 = 21.

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How do you isolate a variable in an equation?

Back

You perform inverse operations to both sides of the equation to get the variable by itself.

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What is the value of x in the equation 12x = 144?

Back

The value of x is 12.

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How do you check if your solution to an equation is correct?

Back

Substitute the solution back into the original equation to see if both sides are equal.

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It means that the variable r is divided by 3, and you need to multiply both sides by 3 to solve for r.

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The solution is r = 10.5.