Substitute Variables with Numbers to Solve

If x=2 and y=4

what is

3x + y + 5

Use your whiteboard and marker to substitute the variable for the number it equals.

Solve using n = 3

For this expression: 4n - 7

Use your whiteboard and marker to substitute the variable for the number it equals.

Solve the following expression using x = 2 and y = 5.

4x + 3y - 20

Use your whiteboard and marker to substitute the variable for the number it equals.

If x+y=14 and x-y=4 then the values of x and y are_________

• x=4 and y = 5

• x = 9 and y = 7

• x = -6 and y = 5

• x = 9 and y = 5

Solve the following expression using a = 4.

9a - 2

Use your whiteboard and marker to substitute the variable for the number it equals.

An Algebraic Expression is a mathematical phrase that includes numbers, ___________, and operations.

• variables

• coefficients

• constants

• Sponge Bob

Plugging in a number for a variable is called

• operation

• evaluation

• substitution

• solving

a letter that stands for an unknown number.

• coefficient

• product

• term

• constant

• variable

• 5

• 4

• 35

• -5