Variables, Expressions and Equations SOL 5.19

Front

What is a variable in mathematics?

Back

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

Front

What does an expression represent?

Back

An expression is a combination of numbers, variables, and operations (like addition or multiplication) that represents a value.

Front

What is an equation?

Back

An equation is a mathematical statement that asserts the equality of two expressions, typically containing an equal sign (=).

Front

How do you represent '23 times a number' using a variable k?

Back

23 x k.

Front

If Bob has 28 stickers and the total with Emily's is 57, how do you express the relationship?

Back

28 + s = 57, where s is the number of stickers Emily has.

Front

How do you express 'a number n, decreased by 12 is 29'?

Back

n - 12 = 29.

Front

What is the formula to find the total number of pages read if Rick reads 28 pages a day for n days to finish a 112-page book?

Back

112 / n = 28.

Front

What does it mean to solve an equation?

Back

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

Front

What is the first step in solving the equation p - 54 = 327?

Back

Add 54 to both sides of the equation.

Front

How do you isolate a variable in an equation?

Back

You perform operations to both sides of the equation to get the variable alone on one side.