9/28/12 - simplify. 1. 2y + 4 – 3y – 5 2. -7(2t + 1) + 10 = -1y – 1 = -14t + 3 hw check today!...
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Think About… Why is 2x + 1 = 5 called a “2-step” equation?TRANSCRIPT
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9/28/12 - Simplify. 9/28/12 - Simplify.
1.1. 2y + 4 – 3y – 5 2y + 4 – 3y – 5
2.2. -7(2t + 1) + 10-7(2t + 1) + 10
= -1y – 1= -1y – 1
= -14t + 3= -14t + 3
HW check today!
This is Sheet #2!
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Mrs. SpanierMrs. SpanierAlgebra 1Algebra 1
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Think About…Think About…
Why is Why is 2x + 1 = 52x + 1 = 5 called a called a “2-step” equation?“2-step” equation?
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Ex. 2x + 1 = 5Ex. 2x + 1 = 5 Why 2 steps?Why 2 steps?It takes 2 steps to solve an It takes 2 steps to solve an equation with 2 operations.equation with 2 operations.–First: Solve addition or subtraction.First: Solve addition or subtraction.–Second: Solve multiplication or Second: Solve multiplication or
division.division.
Work your way towards the Work your way towards the variable.variable.
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Problem 1Problem 1
2x – 11 = 52x – 11 = 5 + 11 +11+ 11 +11 2x = 162x = 16
x = 8x = 8
Add 11 Add 11
Divide by 2Divide by 2
Solution is x=8Solution is x=8
___ ___ 2 2
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Problem 2Problem 2
67 = 11y + 167 = 11y + 1 -1 -1 -1 -166 = 11y66 = 11y
6 = y6 = y
Subtract 1 Subtract 1
Divide by 11Divide by 11
Solution is y=6Solution is y=6
___ ___ 11 11
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Problem 3Problem 3
3r – 8 = -353r – 8 = -35 +8 +8+8 +8 3r = -273r = -27
rr = -9 = -9
Add 8 Add 8
Divide by 3Divide by 3
Solution is r = -9Solution is r = -9
___ ___ 3 3
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Problem 4Problem 4 10 = -7 + c10 = -7 + c
+7 +7+7 +7 17 = c17 = c
c = 34c = 34
Add 7 Add 7 Multiply by 2Multiply by 2
__ 2
__ 2
22
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Problem 5Problem 5
24 = 4 – 2t24 = 4 – 2t -4 -4-4 -4 20 = -2t20 = -2t
t = -10t = -10
Subtract 4 Subtract 4
Divide by -2Divide by -2___ ___ -2 -2
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Before you go…Before you go…
Tell someone in your group Tell someone in your group how you know what to do how you know what to do first.first.
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The EndThe End