Solving Equations
4 + 2p = 10
p = 3
Emily bought two large drinks for $3 each and a large pizza. Her total cost for the food was $22. What was the cost of the pizza?
Use DWSS to solve.
The pizza cost Emily $16.
Image projected on board.
Solve for z.
z = 15
Zach wants to have the balance in his savings account be at least $500. He currently has $50 in the account, and adds $40 each week. How many weeks does Zach need to continue to save to meet his goal?
He must save for at least 12 weeks.
g - 3 ≥ 1
Solve and graph.
g ≥ 4
5 = 2r − 1
r = 3
A young boy is growing at a rate of 3.5 cm per month. He is currently 90 cm tall. At this rate, in how many months will the boy be a height of 132 cm?
Use DWSS to solve.
He will be that tall in 12 months (1 year).
Image projected on board.
Solve for a.
a = 18
Traci is raising money for charity. Her parents donate $75 to her cause, and she plans to raise even more money by participating in a dance marathon. She will be able to raise $12 for every hour she dances. If Traci wants to raise at least $200, how many hours will she need to dance for?
She will need to dance for at least 11 hours.
t/3 ≤ 2
Solve and graph.
t ≤ 6
8 − 2d = 4
d = -2
During a recent sale, the first movie purchased cost $29, and each additional movie costs m dollars. If Jose buys 4 movies and spends a total of $64.80, how much did each additional movie cost?
Use DWSS to solve.
Each additional movie was $8.95.
Image projected on board.
Solve for z.
z = 71
Gary is paid a weekly salary of $50 plus $15.50 for every hour he works. If Gary hopes to make over $400 this week, how many hours does he need to work? (Round to the nearest hour.)
Gary must work 23 or more hours.
2x + 7 ≤ -15
Solve and graph.
x ≤ -11
-3x + 8.5 = -12.5
x = 7
The sum of two consecutive numbers is 75.
Find those numbers. Use DWSS to solve.
37 and 38
Image projected on board.
Solve for r, s, t.
r = 155
s = 25
t = 155
Doug wants to read for at least 15 hours per week. On both Monday and Tuesday, he reads 4½ hours. For the remaining 5 days, he reads the same amount each day. What is the amount of time he will read for each of the remaining days?
He must read at least 1.2 hours each day to meet his goal.
4p - 2 > 8
Solve and graph.
p > 10/4
-⅔ b - 12 = -20
b = 12
The cost of admission to a museum is $3.25 per person over the age of 3; kids 3 and under get in for free. If the total cost of admission for the Warrick family, including their two 6-month old twins, is $19.50, how many family members are over 3 years old?
Use DWSS to solve.
There are 6 people over 3 years old.
Image projected on board.
Solve for r and p.
r = 44
p = 136
Brenda has $500 in her account. Recently, she needed to get her car repaired, so she withdrew $150. In addition, every week she withdraws $40 for miscellaneous expenses. How many weeks can she withdraw the money if she wants to maintain a balance of at least $200?
She can complete the withdraws for 3 weeks.
-2y + 18 < 20
Solve and graph.
y > -1