Intro Equations with Two Variables

Select all equations that are represented in this diagram.

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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

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

• y

• 19

• x

• 2

The sum of two numbers is -2.  The difference is -​ 12.  
Find the 2 numbers

​ ​ (a)   ​ (b)   ​

• 5

• -7

• 6

• -4

• 3

• -3

• 2

• -2

?

Mathematical Equivalence

OFF

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

How do we figure out the value of a variable?

• Add up all the numbers in the equation.

• Multiply the variable by itself.

• Isolate the variable on one side of the equals sign.

• A variable has no set value.

A solution of a System of Linear Equations is a (n)

• Ordered Pair

• Right Answer

• Variable

• Number

What does the solution of a System of Linear Equations represent?

• Point of Intersection of the graphs

• The Difference between the Slopes

• The Product after using Inverse Operations

• The Right Answer