Solving an equation with negative coefficients: EXAMPLE 1 EXAMPLE 2 Ch. 3.1 continued Solving an equation with negative coefficients: EXAMPLE 1 EXAMPLE 2 Solve: 7 – 4y = 19 Solve 12 – 4s = -12 7 – 4y = 19 12 -4s = -12 -7 -7 -12 -12 -4y = 12 -4s = -24 -4 -4 -4 -4 y = -3 s = 6

EXAMPLE 3 5 – X = 198

EXAMPLE 3 -4 + 3m = 29 +4 +4 3m = 33 3 3 m = 11

Practice on your own! 6 – 2m = 8

-2 = 5 - n

20 – 12m = 44

– 2y + 11 = 31

What is the important information? Word problems involving two-step equations You are buying a drum set that costs $495. The music store lets you make a down payment. You can pay the remaining cost in three equal monthly payments with no interest charged. You make a down payment of $150. How much is each monthly payment? Set up your equation: 150 + 3p = 495 Solve: -150 -150 3p = 345 3 3 p = 115 What is the important information? Costs $495 Down payment of $150 I have 3 months to pay remaining amount ($495 - $150)

Word problems involving two-step equations You go to a local candy store to purchase some rock candy and chocolate bars. You have a total of $5 in your pocket to spend. If you purchase one bag of rock candy for $1.75, how many chocolate bars can you purchase if each chocolate bar costs $1.50?

Homework Page 123 #’s 5-6, 15-22, 28, 32-33, 46