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Do Now. On my website under “Math Activities” Arcademic - “Swimming Otters” under Algebra- to practice solving algebraic equations ONLY USE YOUR FIRST NAME as the player name Which weighs more a pound of iron or a pound of feathers? THEY ARE THE SAME

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Do Now

  • On my website under “Math Activities”

  • Arcademic- “Swimming Otters” under Algebra- to practice solving algebraic equations

  • ONLY USE YOUR FIRST NAME as the player name

  • Which weighs more a pound of iron or a pound of feathers? THEY ARE THE SAME

  • How is the moon like a dollar? THEY BOTH HAVE 4 QUARTERS

    3. What is alive and has only 1 foot? A LEG


1/3/2014 6-1 E Solve & Write Subtraction Equations


The Goal of Solving Equations…

to get the variable by itself on one side of the equation


X - 3

2

=

Solvex – 3 = 2

Think of this equation as a balance scale.

Whatever you do to one side has to be done to the other to keep it balanced!


Ex. 1 Solve x – 3 = 2

x – 3 = 2 Write the equation!

+ 3 = + 3 Add 3 from x + 0= 5 each side to “undo”

the subtraction of x = 53 on the left side.


Then Check!

x – 3 = 2

5 - 3 = 2

2 = 2


Ex. 2

The difference between the number of people that visit Great Adventure on a Saturday and the number of people that visit the park on a Wednesday is 1,465. Saturday is the busiest day of the week. There are 4,320 visitors on Wednesday. How many visitors are there on Saturday? Write and solve an equation.


x – 4,320 = 1,465Write the equation.

+ 4,320= + 4,320Subtract 120 from each side.

x= 5,785Simplify.

There were 5,785 visitors to Great Adventure on Saturday.

Check5,785 – 4,320 = 1,465


Ex. 3 5.14 = j – 3.2

5.14 = j – 3.2 Write the equation!

+ 3.2 = + 3.2 Add 3.2 from 8.34= j each side to “undo”

the subtraction of j = 8.343.2 on the right side.


Then Check!

5.14 = j – 3.2

5.14 = 8.34 – 3.2

5.14 = 5.15


Ex. 4


Ex. 5


Ex. 6: Solve 10 = y - 4

10 = y – 4 Write the equation!

+ 4 = + 4 Add 4 from each side to “undo” the subtraction of 4 on the right side.

14 = y


Then Check!

10 = 14 - 4

10 = 14 – 4

10 = 10


Practice Time!

Your Turn!


Solve and

  • x - 5 = 9

  • b – 4.4 = 1.6

  • 4 = y - 8

  • 3 = n – 2


Homework

  • Pg. 330 #1-24 Evens

  • Test Corrections due January 10th

  • Study Quiz Tuesday!


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