y = kx
k = y/x
Is it Proportional?
Better Buys
PERCENT PERCENT PERCENT
100
Determine y if k = 1/2 and x = 2/3
What is 1/3?
100
Determine k if y = 2 and x= 5
What is k = 2/5
100
x: {2, 3, 4, 5, 6} y: {4, 5, 6, 7, 8}
Not proportional: 2/4 is not equal to 4/6.
100
2-meter roll of red ribbon for $1.00 OR 8-meter roll of red ribbon for $4.32
What is 2 meter roll of red ribbon.
100
12% of 45 is ________.
What is 5.4?
200
The unit price for bottles of Snapple at Panzer's is £1.35 a bottle. Write an equation and determine the cost of a DOZEN Snapple bottles.
What is y = 1.35x ; a dozen bottles: £16.20
200
Determine k if y = 1/2 and x = 3/4
What is 2/3?
200
x:{10, 30, 50, 80} y:{5, 15, 25, 40}
Yes: y= 1/2x (k= 1/2)
200
Which is the better buy? 7-ounce bottle of soap for $3.22 9-ounce bottle of soap for $3.60
What is the 9 ounce bottle?
200
16 is 20% of _______.
80.
300
Write an equation to determine the cost of purchasing "x" bags of peanuts, if peanuts cost £0.78 per small bag.
What is y=.78x
300
Determine k if x = 4.5 and y = 22.5.
What is k = 5?
300
x: {8, 16, 24, 48} y: {1, 2, 3, 4}
Yes: y= 1/8x; k = 1/8
300
Which is the better buy? 2-pack of wooden boxes for $3.60 6-pack of wooden boxes for $10.14
What is the 6-pack of boxes.
300
What percent is 18 of 45?
What is 40%?
400
Write an equation to determine the cost of 8 kooshballs if 5 kooshballs cost £16.25.
What is y=3.25x; y = 3.25(8), y= $£26
400
Determine the unit rate of a can of Fancy Feast (cat food) if a case of 50 costs £48.75.
What is about 98 pence per can?
400
Two pairs of jeans for $45 Three pairs of jeans for $69
No! 45/2 = 22.5, 69/3 = 23
400
43% off or 40% off with an additional 13% off?
What is 43% off?
400
Houda, Eddie and Lily have lunch at Carluccio's. Their total bill is £48.80. Eddie speaks in Italian to the waiter, and gets a special heritage discount, bringing their total bill to £40. How much did the waiter discount the bill?
What is 18%?
500
Write an equation to determine the cost of 15 trombones if 100 trombones costs £2200.
What is y= 22x; y = 22(15) so y= £330.
500
Determine the unit rate per half-litre of soda if a case of 12 litres of soda costs £25.
What is £1.04 per half-litre?
500
Five miles in 120 seconds. Five miles in 2 minutes.
Yes! Both are 2.5 miles in 1 minute.
500
50% off or 35% off with an additional 16 percent off?
What is 50% off.
500
Russell and Shep head to the USA for Thanksgiving and go on a shopping spree. Russell spends $120 at Niketown in Times Square, but with tax, wound up paying $130.20. How much sales tax did Russell pay on his purchase?
What is 8.5% tax?