Algebra 1 - 4.13 Completed Notes 3, 4, 7, and 8

3. Alex bought a new truck for $42.935. According to the dealer, the truck will depreciate approximately $4,200 per year. Write and solve a lienar equation to find how many years until the car is worth $5,135.

 $y=-4200x+42,935$  

(a)  

Tags

CCSS.8.EE.C.7B

4. If you buy a car wash at the gas station for $6.00, the coase per gallon is $2.35. If you have $40, write and solve a linear equation to find the number of gallons of gas you can afford.

 $y=2.35x+6.00$  

(a)  

Tags

CCSS.7.EE.B.4A

7. Karen's piggy bank has all dimes and quarters. The total value of the money in her piggy bank is $11.40. If Karen has 36 quarters, write and solve a linear equation to find the number of dimes she has.

x = dimes
y = quarters

 $.10x+.25y=11.40$  

(a)  

Tags

CCSS.8.EE.C.7B

8.The Oakville High School Marching Band sold gift wrap to earn money for a band trip. Solid color gift wrap sells for $3.50 per roll and printed gift wrap sells for $5 per roll. The band needs to earn $2,500 for an upcoming competition. If the band sells 325 rolls of printed paper, write and solve a linear equation to find the umber of solid paper they must sell.

 $3.50x+5y=2500$  

(a)  

Tags

CCSS.7.EE.B.4A