6.1 - Solving Addition and Subtraction Equations

6.1 - Writing and Solving Equations

By Jus

What are we solving for?

Define a variable.

What key phrase do you see? What operation does it signal?

How do we solve it?​

​

​*Think how would you solve it - equation has to be inverse or opposite!*

​Writing Expressions

What are we solving for?

Define a variable.

What key phrase do you see? What operation does it signal?

How do we solve it?​

​

​

​Writing Expressions

The sum of the measures of the angles in a triangle equal 180 degrees. Write an expression to find the missing angle.

​

​Writing Expressions

Multiple Choice

The 7th grade class at Johnson Middle School has a total of 176 students. This is 34 more than the amount of 8th graders. Write an expression to find the total amount of 8th graders at Johnson Middle School.

Which expression would fit this scenario?

• x + 34 = 176

• x - 34 = 176

• x + 176 = 34

• x - 176 = 34

Multiple Choice

Tiger Woods ended his final round at a score of -5. His score was 8 shots less than Dustin Johnson's score. Write an expression using s to find what was Dustin's score.

• s - 8 = -5

• 8 - s = -5

• s - 5 = 8

• s = 5 - 8

Multiple Choice

Mason had a total of $35.00 at the end of the week from shoveling snow. His total was $13.50 greater than his brothers. Write an expression that can be solved to find his brother's total savings s from shoveling.

• s + 13.50 = 35

• s + 35 = 13.50

• 35 + 13.50 = s

• s - 13.50 = 35

Multiple Choice

The current temperature at Bismark, North Dakota is -11 degrees. This is 63 degrees colder than Louisville, Kentucky. Write an expression to find what the temperature t is in Kentucky.

• t - 63 = -11

• t - 11 = 63

• t + 63 = -11

• t + 11 = 63

Multiple Choice

A triangle has side lengths of 15 inches, 12 inches, and one unknown side x inches long. The perimeter of the triangle totals 47 inches around. Write an expression to find the length of the unknown side x.

• 15 + 12 + x = 47

• 15 + 12 - x = 47

• 47 - 15 + x = 12

• x - 47 = 12

Multiple Choice

What is the first step in solving the equation:

- 5 + b = -12

• add 5 to both sides

• subtract 5 to both sides

• add 12 to both sides

• subtract 12 from both sides

Multiple Choice

What is the first step in solving the equation:

t - 10.67 = 51.7

• add 10.67 to both sides

• subtract 10.67 to both sides

• add 51.7 to both sides

• subtract 51.7 to both sides

Multiple Choice

What is the first step in solving the expression:

6 + y = -11

• subtract 6 from both sides

• add 6 to both sides

• add 11 to both sides

• subtract 11 from both sides

Multiple Choice

Solve the expression:

t - 6.7 = -19.1

Just type in the value in the box (you do not need the variable)

• t = -12.4

• t = 12.4

• t = 25.8

• t = -25.8

Multiple Choice

Solve the expression:

-15 + m = -19

Just type in the value in the box (you do not need the variable)

• m = - 4

• m = 4

• m = - 34

• m = 34

Multiple Choice

Solve the expression:

a + 16.5 = -30

Just type in the value in the box (you do not need the variable)

• a = - 46.5

• a = 46.5

• a = 13.5

• a = - 13.5

Multiple Choice

Solve the expression:

-16 = h - 25

Just type in the value in the box (you do not need the variable)

• h = 9

• h = - 9

• h = - 41

• h = 41