T.5

Write Linear Functions from Situations

Q3 · Feb–Apr

Find the rate of change and the initial value in a situation and write y = mx + b.

Level

Medium

Level

Problems

Show exampleInclude answer key

@page { size: letter; margin: 0; } @media print { .ws-page + .ws-page { break-before: page; } } Daniel Math Academy \cdot Grade 8 Math Write Linear Functions from Situations Skill T.5 \cdot Functions \cdot ★★☆ Medium \cdot Quarter 3 Name Date Score / 4 Scan for answers Write a linear function for each situation. Example y = 30 x + 45 Think: A $ 45 fee plus $ 30 an hour: the fee is paid once, so it is the initial value b; the hourly charge is the rate of change m. 1 A tank holds 400 gallons of water and drains 10 gallons per minute. Write the water left y after x minutes. 2 A candle is 15 cm tall and burns 3 cm each hour. Write its height y after x hours. 3 A tank holds 550 gallons of water and drains 10 gallons per minute. Write the water left y after x minutes. 4 A tank holds 300 gallons of water and drains 25 gallons per minute. Write the water left y after x minutes. Daniel Math Academy \cdot danielmath.com Worksheet # jbb6tkm \cdot Page 1 / 2 Daniel Math Academy \cdot Grade 8 Math Answer Key T.5 Write Linear Functions from Situations \cdot ★★☆ Medium 1 y = - 10 x + 400 2 y = - 3 x + 15 3 y = - 10 x + 550 4 y = - 25 x + 300 Daniel Math Academy \cdot danielmath.com Worksheet # jbb6tkm \cdot Answer Key \cdot Page 2 / 2

T. Functions7 skills