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Homework 1 Name:_____________________________ Period:_______ Due: 1/17/13 1. Solve Each System By Graphing
a. ! = − !
!! + 3 b. ! = 4! + 3 c. ! = −1
! = !!! − 3 ! = −! − 2 ! = − !
!! + 4
2. Write a system of equations for the following situations and solve using graphing.
a. Sophia spent $60 on new jewelry. Necklaces cost $10 and earrings cost $5. If she bought a total of 7 then how many
of each kind did she buy?
b. There are 13 animals in the barn. Some are chickens and some are pigs. There are 40 legs in all. How many of each animal are there?
3. Solve Each System by Substitution
a. ! = 6! − 11 b. 2! − 3! = −1 c. ! = −3! + 5 −2! − 3! = −7 ! = ! − 1 5! − 4! = −3
d. −3! − 3! = 3 e. ! = −2 f. ! = 5! − 7 ! = −5! − 17 4! − 3! = 18 −3! − 2! = −12
4. Write a system of equations for the following situations and solve using substitution.
a. A class of 195 students went on a field trip. They took 7 vehicles, some cars and some buses. Find the number of cars and the number of buses they took if each car holds 5 students and each bus hold 45 students.
b. On a canoe trip, Rita paddled upstream (against the current) at an average speed of 2 mi/h relative to the riverbank.
On the return trip downstream (with the current), her average speed was 3 mi/h. Find Rita’s paddling speed in still water and the speed of the river’s current.