Proportions
Is 3/4=9/12 proportional?
Yes
Solve: 3x + 5 = 20
What is x = 5?
Solve: x + 4 > 10
What is x > 6?
Simplify the ratio: 18:12
What is 3:2?
Combine like terms: 3x+5x.
What is 8x?
If 3/x = 6/10, solving this proportion gives you the value of x.
What is 5?
Solve: 4x-7=21
What is x=7?
Solve: 3x>15
What is x<5?
A rate that compares a quantity to 1 unit.
What is a unit rate?
Simplify: 7+2x+3.
What is 2x+10?
A car travels 120 miles in 2 hours at a constant speed. Using a proportion, this is how far it travels in 5 hours.
What is 300 miles?
Solve: 5x-8=2
What is x = 6
Solve: 3x > 15
What is x < 5?
If you drive 180 miles in 3 hours, this is your unit rate in miles per hour.
What is 60 miles per hour?
A number plus 8 equals 15. This is the number.
What is 7?
If 3 notebooks cost $6, and the price stays proportional, this is how much 10 notebooks cost.
What is $20?
Solve: 5x - 8 = 2
What is x = 2
4x-8<2x+6
What is x < 7?
$12 for 4 notebooks gives this unit price per notebook.
What is $3 per notebook?
Twice a number equals 18. This is the number.
What is 9?
Solving the proportion 7/x=21/36, this is the value of x.
What is 12?
Solve: -3x + 12 = 0
What is x=4?
Solve: 2x-5>9
What is x > 7?
If there are 8 boys and 12 girls, this is the ratio of boys to girls in simplest form.
What is 2:3?
Three more than a number is 10. This is the number.
What is 7?