Transcript Answer to Homework
Warm ups - simplify
3(
x
4) + 5
x
+ 10 5 + 2(
y
+ 3) 7
y
+ 1 8
x
+ 7(2
y
3) 3
x
5(2
x
4) 3(
x
+ 1)
Math Binder
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Current Notes Old Notes Homework Review Sheets Quizzes/Tests
3-3 Solving Multistep Equations
Objective: To solve equations using add., subt., mult., and division.
Examples 1 – 3 (watch & listen)
y
5n + 6 = -4
-6 -6 5n = -10 5 5
n = -2 17 = 7y + 87
5 (5) 6 -9 -9
y
3 (5) 5
y
15
Examples 4 – 6 (do with me)
0.6
n
d
4 2 = 3
x
3 8
Example 7 – 9 (with a partner)
3
y
8
d
1 6 3
x
30
x
TOO (Try on your own)
5
p
4
m
5 31
Solve.
3(
x
5 3
x
2 5 2(
x
3) 7
x
1
Recap with a partner…
1) 2) Explain to your partner how to solve a multi-step equation. Explain how to solve the following equation: 3 2
a
Homework
Pg. 160 # 17 – 33 odd Check your answers in the back of the book.
Math Lab
Review today ’ s lesson Homework Please finish worksheets from last week:
Why did the ant run across the cracker box?
What did the Spanish Farmer say to his chicken?
Objective
The student will be able to:
solve two-step equations.
Designed by Skip Tyler, Varina High School
To solve two-step equations, undo the operations by working backwards.
x
Example: 2 7 Recall the order of operations as you answer these questions.
Ask yourself, 1.
What is the first thing we are doing to x?
2.
What is the second thing?
• • Dividing by 2 Subtracting 3 To undo these steps, do the opposite operations in opposite order.
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2.
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6.
1) Solve 2x - 1 = -3
+ 1
Draw “ the river ” Add 1 to both sides Simplify Divide both sides by 2 Simplify Check your answer
2( 2x = -2 2 2 -1 + 1 x = -1 ) - 1 = -3 -2 – 1 = -3
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2) Solve
Draw “ the river ” Add 4 to both sides Simplify Clear the fraction -Multiply both sides by 3 Simplify Check your answer
x
8 3
+ 4 + 4 3 ·
x
3 12
x = 36 · 3
36 3 8 12 – 4 = 8
Try these on your own...
x = 3 7 y = 8 -2 -2z = -12 4w = 16 2x = 12 3 3x = 9 -4
The answers...
x = 21 y = -16 z = 6 w = 4 x = 18 x = -12