
Solving Linear Equations With a Single Variable
Presentation
•
Mathematics
•
8th Grade
•
Practice Problem
•
Medium
Standards-aligned
Stephen McDaniel
Used 188+ times
FREE Resource
10 Slides • 13 Questions
1
Solving Linear Equations With a Single Variable
using properties of equality
2
Linear Equations
A linear equation is an equation whose graph will make a straight line. Linear equations do not include variables raised to a power or square roots of variables.
3
Multiple Select
Which of the equations shown below would be an example of a linear equation with a single variable? Remember that a linear equation with a single variable will not include any variables raised to a power or any roots of variables. These equations will also not include more than one variable, although the same variable can appear more than once. Check all that apply.
a2+25=50
4x−12=63
5(b−7)=8b+15
5c+d=45−a
4
Steps for solving a linear equation with a single variable
1) Apply the Distributive Property if possible
2) Combine like terms on each side of the equation if necessary
3) Simplify by using properties of equality so that you're left with a variable term on one side and a constant on the other
4) Isolate the variable to find it's value
5
Step 1: Apply the Distributive Property if possible
If an equation has parentheses, you should be able to simplify it using the Distributive Property. The Distributive Property states that you can distribute multiplication across addition or subtraction. Some examples are shown to the right.
6
Multiple Choice
Which of the following equations would be equivalent to 4x+3=8(x+4) after the Distributive Property has been applied?
4x+7=12
4x+3=8x+32
4x+3=8+4x
7
Multiple Choice
Which of the following equations would be equal to 5(4−y)=45−6y after the Distributive Property has been applied?
20−y=39y
4−5y=45−6y
20−5y=45−6y
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Step 2: Combine like terms on each side of the equation if necessary
Like terms can be combined on each side of the equation to simplify. Remember like terms are terms that either have the same variable or no variable at all.
9
Multiple Choice
Which of the following equations would be equivalent to 4x+6+8x=2x+18 after like terms are combined? Remember you can only combine like terms on one side of the equals sign.
12x+6=2x+18
14x=12
10x+8=2x+18
10
Multiple Choice
Which of the following equations would be equivalent to 9y−14=5y−12−6 after like terms are combined? Remember you can only combine like terms on one side of the equals sign, and anything being subtracted must be treated as a negative value.
14y−14=−18
9y−14=5y−18
9y−14=−7y−6
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Step 3: Simplify by using properties of equality
When you have variable terms on both sides of the equation, you can simplify by either adding or subtracting the same amount from both sides. You want to simplify the equation so that you have one variable term left on one side and a constant on the other.
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Multiple Choice
Which of the following equations would be equal to 12x+6=9x+15 after simplifying by using properties of equality?
3x=21
21x=21
3x=9
13
Multiple Choice
Which of the following equations would be equal to 9x−30=4x+20 after simplifying by using properties of equality? Remember that anything being subtracted must be added to both sides in order to be canceled.
5x=50
13x=10
13x=50
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Step 4: Isolate the variable to find its value
If you are able to get the variable on one side of the equation by itself, you will know its value. This is done by performing the opposite of what is being done to the variable and usually involves multiplication or division.
15
Multiple Choice
Solve the equation 3y=27 by isolating the variable.
y=3
y=9
y=87
16
Multiple Choice
Solve the equation −4z=12 by isolating the variable.
z=8
z=−3
z=−48
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Now we will solve an equation from start to finish using all four steps
We will perform one step at a time
18
Multiple Choice
Step 1: Simplify the equation 4(x+6)+2x=12x−18 by applying the Distributive Property. We are only performing one step at a time.
4x+8x=12x−18
4x+24+2x=12x−18
8x+6=12x−18
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Multiple Choice
Step 2: Simplify the equation 4x+24+2x=12x−18 by combining like terms. We are only performing one step at a time.
6x+24=12x−18
30x=12x−18
6x+24=−6x
20
Multiple Choice
Step 3: Simplify the equation 6x+24=12x−18 by using properties of equality. Remember to cancel terms by either adding or subtracting the same thing from both sides.
6=6x
18x=6
42=6x
21
Multiple Choice
Step 4: Solve the equation 42=6x by isolating the variable. Remember to perform the opposite of what is being done to the variable on both sides.
x=12
x=7
x=252
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Here is a recap of the steps we took to solve this problem
Step 1: Apply the Distributive Property
Step 2: Combine Like Terms
Step 3: Simplify using properties of equality
Step 4: Isolate the variable
23
These steps an be used to solve ANY linear equation with a single variable.
Good luck with solving equations!
Solving Linear Equations With a Single Variable
using properties of equality
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