Solve One-Step Addition and Subtraction Equations

Solve One-Step Addition and Subtraction Equations

Mr. Wasfi

Vocabulary Start-up

• Equation

• is a sentence stating that two quantities are equal. x+3=9

• solution

• is the value of a variable that makes an equation true x=6 is a solution for x+3=9

Equivalent equations

• equations have the same solution.

• x+7=10 and x+2=5

• Who can give me an equation which is equivalent to x+5=1

• x+8=4

• x=-4

Multiple Select

Which of the following equations that are equivalent to x=3.

Use algebra tiles if needed.

• X+3=6

• X+1=6

• X+6=8

• X+2=5

• X+1=4

Subtraction Property of Equality

• it states that the two sides of an equation remain equal when you subtract the same number from each side.

• Solve x+6 =4. Check your solution

• X+6-6=4-6

• X = -2

• Chek: x+6=4

• -2+6=4 then 4 = 4

• So the solution is -2

Subtraction Property of Equality

• Solve-5=b+8. Check your solution

• -5-8=b+8-8

• -13=b

• Chek: -5=b+8

• -5=-13+8

• then -5=-5

• So the solution is -13

Multiple Choice

Solve

y+6=9

• y=-15

• y=15

• y=3

• y=-3

Multiple Choice

Solve

x + 3 = 1

• x = 2

• x = -2

• x = 4

• x = -4

Multiple Choice

Solve

-3 = a + 4

• a = 1

• a = -1

• a = 7

• a = -7

• An angelfish can grow to be 30 centimeters long.

  If an angelfish is 21 centimeters longer than a clown fish, how long is a clown fish?

• Let c represent the length of the clown fish.

• Equation 30 = c + 21

• 30-21 = c+21-21

• 9=c

• the length of the clown fish is 9 cm.

Multiple Select

The highest recorded temperature in Warsaw, Missouri, is

48°C. This is 70°C greater than the city’s lowest recorded

temperature. Find the lowest recorded temperature.

• t = -22

• t = 22

• t = 112

• t = -112