Metodo Cuantitativo

1. Suppose a refrigerator that sells for $300 costs $85 a year for electricity. Write an expression for the cost to buy and run this refrigerator for “x” years.

y = 700+85x x=1 x =2 x=3

x=4 x=5 x=6

x=7 x=8 x=9

x=10

y=700+85(1)

y=785

y=700+85(2)

y=870

y=700+85(3)

y=955

y=700+85(4)

y=1040

y=700+85(5)

y=1125

y=700+85(6)

y=1210

y=700+85(7)

y=1295

y=700+85(8)

y=1380

y=700+85(9)

y=1465

y=700+85(10)

y=1550

2. Suppose another refrigerator costs $1000 and $25 a year for electricity. Write an expression for the cost to buy and run this refrigerator for “x” years.

y = 1000+25x x=1 x =2 x=3

x=4 x=5 x=6

x=7 x=8 x=9

x=10

y=1000+25(1)

y=1025

y=1000+25(2)

y=1050

y=1000+25(3)

y=1075

y=1000+25(4)

y=1100

y=1000+25(5)

y=1125

y=1000+25(6)

y=1150

y=1000+25(7)

y=1175

y=1000+25(8)

y=1200

y=1000+25(9)

y=1225

y=1000+25(10)

y=1250

3. Over 10 years, which refrigerator costs the most? By how much?

Refrigerator #1 = $1550

By $300

4. In how many years will the total costs for the two refrigerators be equal?

Five years = $1125

1. Suppose a refrigerator that sells for $300 costs $85 a year for electricity. Write an expression for the cost to buy and run this refrigerator for “x” years.

y = 700+85x x=1 x =2 x=3

x=4 x=5 x=6

x=7 x=8 x=9

x=10

y=700+85(1)

y=785

y=700+85(2)

y=870

y=700+85(3)

y=955

y=700+85(4)

y=1040

y=700+85(5)

y=1125

y=700+85(6)

y=1210

y=700+85(7)

y=1295

y=700+85(8)

y=1380

y=700+85(9)

y=1465

y=700+85(10)

y=1550

2. Suppose another refrigerator costs $1000 and $25 a year for electricity. Write an expression for the cost to buy and run this refrigerator for “x” years.

y = 1000+25x x=1 x =2 x=3

x=4 x=5 x=6

x=7 x=8 x=9

x=10

y=1000+25(1)

y=1025

y=1000+25(2)

y=1050

y=1000+25(3)

y=1075

y=1000+25(4)

y=1100

y=1000+25(5)

y=1125

y=1000+25(6)

y=1150

y=1000+25(7)

y=1175

y=1000+25(8)

y=1200

y=1000+25(9)

y=1225

y=1000+25(10)

y=1250

3. Over 10 years, which refrigerator costs the most? By how much?

Refrigerator #1 = $1550

By $300

4. In how many years will the total costs for the two refrigerators be equal?

Five years = $1125

1. Suppose

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