on desk: 1. pencil 2. math journal 3. learning log 4.last night’s hw - ? learning log: 1. hw: msa...
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Warm Up 4(x + 4) = 6x x + 10 = 9x -22 Solve the equations below and check your solution.TRANSCRIPT
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On Desk:1. Pencil2. Math Journal3. Learning Log4.Last night’s HW - ?
Learning Log:1. HW: MSA p. 75, #30, 31, 34, 372. Quiz Thurs. 12/103. Test Thurs. 12/17
Math CC7/8 – Be Prepared
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• Last night’s HW – Questions?• Warm Up • Finish 3.5 D-E: Equations & Inequalities• Begin HW?
Tasks for Today
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Warm Up
4(x + 4) = 6x + 18 13x + 10 = 9x -22
Solve the equations below and check your solution.
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Expenses = Income825 + 3.25n = 8.20n - 3.25n - 3.25n 825 = 4.95n
4.95 4.95 166.67 = n (cakes)
•Does this answer make sense?
•What answer would make more sense?
Fabian’s expenses will equal his income when he sells about 167 cakes. (166 isn’t enough!)
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Break-Even Pointor “point of intersection”
• How do you find the break-even point from a table?– Look for when the x and y values for both variables are
equal to each other.
• How do you find the break-even point from a graph?– Look for where the two lines intersect.
• How do you find the break-even point from an equation?– Set the two equations equal to each other and solve.
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E < 2,400 825 + 3.25n < 2,400-825 -825 3.25n < 1,575
3.25 3.25 n < 484.6
Fabian needs to make 484 cakes or less to keep the expenses less than $2,400.
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I > 2,400 820n > 2,400
820 820 n > 292.7
Fabian needs to make 293 cakes or more to keep the income greater than $2,400.
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Yes, these statements make sense. She is simply substituting the income and expense expressions for the variables I and E.
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