Solving for Unknown Variable

What is a variable?

• It's a number equation.

• A letter representing an unknown number in an equation.

• The symbols in an equation that aren't letters or numbers.

• Any equation with an equals sign.

In the equation 2x + 3y = 19, what is/are the variable(s)? Choose the best answer.

• x

• y

• =

• Both x and y are variables

What branch of mathematics deals with equations with variables?

• Algebra

• Geometry

• Calculus

• Physics

Solve for x: 7x + 7 = 21

• x = 7

• x = 4

• x = 3

• x = 2

What is the first step in solving the equation 2y - 11 = 25

• Subtract 11 from 25

• Add 11 to 25

• Divide 25 by 2

• Multiply 25 by 2

In the equation 2x + 3y = 19, what is the constant?

• y

• 19

• x

• 2

To solve an equation, the goal is to __________ the variable on one side.

• Evaluate

• Leviate

• Isolate

• Reciprocate

A letter or symbol that represents an unknown value is called ______________.

• Variable

• Radicand

• Coefficient

• Constant

When you add a number to each side of an equation, you are using the ___________.

• Addition Property of Equality

• Subtraction Property of Equality

• Multiplication Property of Equality

• Division Property of Equality

A value that when substituted for the variable will make an equation true is a ____________.

• Term

• Constant

• Evaluation

• Solution