http://. is this a “ positive 5 ” or “ plus 5 ”? 5 – 2x = 14 both +
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Is this a “positive 5” or “plus 5”? 5 – 2x = 14
is the same a s apositive 5 plus 5
BOTH
+
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HINT: If you don’t see a negative or positive sign in front of a number it is always positive.
5+
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Is this a “negative 7x” or “minus 7x”?
2 – 7x = 10
BOTH
is the same as a negative 7x minus 7x
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HINT: The sign in front of the number BELONGS TO THE NUMBER!
–7
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I will show you 2 ways to solve this equation!
3x 7 5x 13 3x 7 5x 13 3x 3x
7 2x 13 13 13 20 2x2 2
10 x
5x 5x 2x 7 13
7 7 2x 20 2 2 x 10
Which one do you think is easier?
WHY?
Same answer!
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It is easier if you move the smaller number
of x’s to one side.
If you move the larger number of x’s you will end
up with negative x’s
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Solve With x’s on Both Sides 7x 5 3x 23
3x 3x 4x 5 23
5 5 4x 284 4
x 7
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Solve With x’s on Both Sides x 5 6x 20
x x 5 5x 20
20 20 25 5x 5 5
5 x
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13 = 4(3x – 7) + 5
13 = 12x - 28 + 5
13 = 12x - 23 +23 +23
36 = 12x__ ___ 12 12
3 = x
13 = 4(3 3 – 7) +5
13 = 4(9 - 7) + 5
13 = 8 + 5
13 = 13
13 = 4(2) + 5
Solve With The Distributive Property
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3y 6(y 2) 24 3y 6y 12 24
9y 12 24 12 12 9y 369 9
y 4
Solve With The Distributive Property
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48 4m
24 6(m 4) 2m
24 6m 24 2m
24 4m 24 24 24
4 412 m
Solve With The Distributive Property
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4 4
8 4(x 3) 32
8 4x 12 32
4x 4 32 4 4
4x 36
x 9
Solve With The Distributive Property
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4(x 2) 3(x 1)
3x -3xx 8 3
8 +8x 11
4x 8 3x 3
Solve With The Distributive Property
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5(8 x) 3(x 8)
5x 5x 40 8x 24 24 24 64 8x8 88 x
40 5x 3x 24
Solve With The Distributive Property
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3(4x 20) 4(5 2x)
8x 8x 20x 60 20
60 60 20x 8020 20
x 4
12x 60 20 8x
Solve With The Distributive PropertyChallenging One!
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The End!Take out your study guide!
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#19
1) Get rid of the parenthesis by distributing
2) Combine like terms
3) Move the smaller number of x’s to one side
4) Move all numbers to the other side
5) Get x all by itself
6) Check your answer in the original equation
Circle answer. Show work in the check!
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5(m - 6) = 10
5m - 30 = 10 + 30 +30
5m = 40
5 5m = 8
Get rid of parenthesis first by distributing.
#20
Check
in
the
original
equation!
5(8 - 6) = 10
Do
PEMDAS
in the
check! 5(2) = 10
10 = 10
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8x - 4 = 3(2x + 8) Get rid of the parenthesis.8x - 4 = 6x + 24 Get the variables on one side.
Subtract 6x from both sides.-6x -6x
6x and –6x cancel out2x - 4 = 24
Add 4 to both sides. + 4 + 4
x = 14 Divide both sides by 2.
2x = 28__ __ 2 2
#21
Show your check! 8(14) - 4 = 3(2 14+8)112 - 4 = 3(36) 108 = 108 Finish your check!
EXTRAS: You can use them the next day when going over
homework corrections.
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2(3x 1) 4(10 2x)
8x 8x 14x 2 40
2 2 14x 4214 14
x 3
6x 2 40 8x
Solve With The Distributive PropertyChallenging One!
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13 = 4(3x – 5) + 9 13 = 12x - 20 + 913 = 12x - 11
+11 +1124 = 12x__ ___ 12 122 = x
#Extra
13 = 4(3 • 2 – 5) +913 = 4(6 - 5) + 9
13 = 4 + 9
13 = 13
13 = 4(1) + 9
Show work in the check!
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