Tables
Equations
Graphs
Proportional Graphs
Percent Problems
100
Every one cup of sugar uses _____ cups of flour?
1.5 cups
100
What is the equation for proportional relationships?
y=kx
100
Why is this graph not proportional?
It's not going through the origin (0,0)
100
Are proportional graphs straight or curved?
straight
100
A store is having a sale where school supplies are 30% off their original price. A backpack is on sale for $11.20. What was the original price of the backpack?
(We are trying to find the whole amount of the backpack! Use PART = % * WHOLE )
$16
200
Write the equation for the following table.
y=(1/2)x
200
Write the equation of the relationship of two quantities if you know the constant of proportionality is 5.
y=5x
200
Why is this graph proportional?
There is a straight line that goes through the origin (0,0)
200
Do proportional graphs form a line or an x shape?
a line
200
Fred completes 10 math problems. This represents 40% of the number of math problems he has to do.
How many math problems must he do?
25 Math Problems
300
Is the following ratio table proportional?
No, there is no consistent constant of proportionality!
300
What equation represents the graph?
y=0.66x or y= 2/3 x
300
What is the constant of proportionality?
6
300
What special point must all proportional graphs go through?
the origin or (0,0)
300
A store is having a sale where winter clothes are 60% of the original price. A sweater is on sale for $30.
What was the original price of the sweater?
$50
400
Complete the proportional table by writing the missing number.
171
400
If water used varies directly with time, what is the equation of the relationship?
y=5x
400
What is the constant of Proportionality?
1/6
400
How do you know a graph is proportional?
When the points form a straight line through the origin.
400
In the first year of ownership, a new car can lose 20% of its value. If a car lost $4,200 of value in the first year, how much did the car originally cost?
$21,000
500
4 liters
132 km
500
Becca completes 42 math problems in 12 minutes. Write an equation to represent how long each problem takes.
y=3.5x
500
What is the constant of proportionality?
40
500
Can a proportional graph be a straight vertical line?
Please explain and show reasoning.
No because...
500
A shoe store is offering 25% off all sneakers. A pair of sneakers is on sale for $45.
What was the original price of the sneakers?
$60.00