Mathematics
Grade 8
15 min
Write linear functions: word problems
Write linear functions: word problems
Tutorial Preview
1
A taxi charges a $3 fee plus $2 per mile. Write a function for the total cost.
2
A phone starts with a 100% charge and loses 5% every hour. Write a function for the remaining charge.
3
After 2 hours of driving, you are 120 miles from home. After 4 hours, you are 220 miles from home. Write a function for your distance.
Sample Practice Questions
Easy
A baker sells cookies for $2 each plus a $3 box fee. Write a function for the total cost y for x cookies.
0.y=2x+3
1.y=3x+2
2.y=5x
3.y=2x-3
Easy
A streaming service costs $10 per month plus a $20 sign-up fee. Write a function for the total cost y after x months.
0.y=20x+10
1.y=10x+20
2.y=30x
3.y=10x-20
Easy
A water tank holds 50 gallons. It leaks 2 gallons per hour. Write a function for the water y left after x hours.
0.y=50x-2
1.y=2x+50
2.y=-2x+50
3.y=48x
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