Equations

Equations

Substitution

Taking a numerical value and plugging it in for the variable

What is Substitution

• You will be given an expression and a variable value

• Take the variable value and plug it in to solve

Here's an Example

• 5x + 2 when x = 6

• Plug in 6 for x

• 5(6) + 2

• Follow order of operations and solve

• 5 x 6 = 30

• 30 + 2 = 32

• The answer to this expression is 32

You Try:

• 3x - 5 when x = 7

• 3(7) - 5

• 3(7) = 21

• 21 - 5 = 16

• 16 is the answer to this expression

Multiple Choice

Evaluate the expression for n = 6

9 - n

• 15

• 4

• 3

• -3

Multiple Choice

Evaluate the expression for m = 2

8m

• 4

• 6

• 10

• 16

Multiple Choice

Evaluate the expression for q = 3

1 + 2q

• 7

• 2

• 8

• 12

Multiple Choice

Evaluate the expression for h = –4

-12h - 100

• 148

• -52

• -148

• 52

Multiple Choice

The inverse operation for addition is multiplication

• True

• False

Multiple Choice

The inverse operation for division is subtraction

• True

• False

Multiple Choice

The inverse operation for addition is subtraction

The inverse operation for multiplication is division

• True

• False

Multiple Choice

Why is it important to remember "what you do to one side of the equation you MUST do to the other."

• Because Ms. Phillips & Mr. Adamson said so

• Because equations are hard to do

• Because an equation must be balanced

• I don't really know to be honest

Multiple Choice

Solve the equation:

15 + b = 23

• b = 38

• b = 8

• b = 345

• b = -2

Multiple Choice

Solve the equation:

3 + p = 8

• p = 11

• p = 24

• p = 2

• p = 5

Multiple Choice

Solve the equation:

26 = 8 + v

• x = 18

• x = 34

• x = 4

• x = 2

Multiple Choice

Solve the equation:

r -2 = 1

• r = -3

• r = 5

• r = 3

• r = 7

Multiple Choice

Solve the equation:

 $\frac{b}{4}=5$  

• b = 16 

• b = 2

• b = 20

• b = 24

Multiple Choice

Solve the equation:

7m = 84

• m = 588

• m = 2

• m = 16

• m = 12

Multiple Choice

What value of a is a solution to this equation?

8a = 56

• a = 5

• a = 7

• a = 12

• a = 2

Multiple Choice

What value of s is a solution to this equation?

8 + s = 19

• s = 11

• s = 2

• s = 27

• s = 16

Multiple Choice

What value of q is a solution to this equation?

2q = 12

• q = 6

• q = 2

• q = 16

• q = 3

Multiple Choice

 $2\ =\frac{q}{6}$  

What value of q is a solution to this equation?

• q = 6 

• q = 2

• q = 4 

• q = 12