Solving Systems Word Problems.notebook
Journal Question #6
October 25, 2012
10­25­12
1. Explain when you would want to use the substitution method versus the elimination method to find where two lines intersect? Give an example of a problem that would be easiest to solve using substitution and a different example that would be easiest using elimination.
2. Use substitution to solve ­5x + y = 6
2x ­ 3y = 60
3. Use elimination to solve 3x + y = 20
y = 12 ­ x
4. Use elimination to solve 2x + 5y = ­1
x + 2y = 0
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Solving Systems Word Problems.notebook
October 25, 2012
Solving Real World Problems
Shopping at Savers Mart, Melissa buys her children 4 shirts and 3 pairs of pants for $85.50. She returns the next day and buys 3 shirts and 5 pairs of pants for $115.00. How much did each shirt and each pair of pants cost?
You purchase 8 gallons of paint and 3 brushes for $152.50. The next day, you purchase 6 gallons of paint and 2 brushes for $113.00. How much does each gallon of paint and each brush cost?
Define your variables.
Set up your equations.
Decide whether or not to use
substitution or elimination.
Break Even Problems
Megan's bakery sells single­crust pies for $6.99 and double­crust pies cherry pies for $10.99. The total number of pies sold on a busy Friday was 36. If the amount earned for all the pies that day was $331.64, how many of each type of pie did she sell?
VIDEO
Suppose Jehison is starting his own business. If Jehison had to spend $500 up front on supplies, when will he break even if he plans to charge $35 per service call? 2
Solving Systems Word Problems.notebook
October 25, 2012
Homework
Solving Systems of Equations Word Problems Worksheet WS #10
3 Little Pigs Worksheet WS #11
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