8th grade -MUA Unit 5

Which point is on the graph of the function y=3x+2 ?

• (1,5)

• (2,3)

• (3,2)

• (5,1)

Answer explanation

Input the x and y into the equation. For instance, y=3x+2 and (3,1). 1=3(3)+2 --> 1= 9 + 2

--> 1 ≠ 11 therefore, (3,1) is not a point on the graph.

This table shows a linear relationship between the the age of a newborn baby in weeks and their weight.

Select all the true statements.

• A. The weight of the baby increases at a constant rate of 2 lbs every week.

• B. The weight of the baby increases at a constant rate of 1 lb every week.

• C. The weight of the baby increases at a constant rate of ½ lb every week.

• D. Age is a function of weight.

• E. Weight is a function of age.

The graph shows the amount of water in a bathtub starting at 10:00.

Select all true statements.

• A. The tub was filling faster at 10:14 than at 10:01.

• B. At 10:06, the tub was neither filling nor draining.

• C. The maximum amount of water in the tub was about 35 gallons.

• D. The amount of water in the tub stayed the same from 10:16 to 10:20.

• E. It took 4 minutes for the tub to drain.

Mai hiked up a trail for 40 minutes. The graph shows the elevation in feet that she reached throughout her hike. Name the time period where Mai gained elevation at the fastest rate.

A tree planted today has a height of 5 feet and grows one foot each month.

Is the height of the tree a function of the number of months? If so, is it a linear or a nonlinear

function? Explain your reasoning.

Answer explanation

Is this a linear function? Yes or no? How many inputs and how many outputs are there? If there is one input and output that makes a function, if you see more than one input or output, it is a non function.

Draw a graph of Lin’s distance as a function of time for this situation: Lin walked a half-mile to school at a constant rate. Five minutes after arriving at school, Lin realized that she had left her permission slip at home. Lin began sprinting home, but when she was halfway there she got tired and walked the rest of the way.

Answer explanation

Dont forget to add your units. If we are discussing time is it in sec, mins, hours? If it is distance is it in meters, yards, feet, etc. -Ms. Watts

if you don't it I'm coming to your house. -DeVari :]

Two cleaning services charge money for each hour of work, plus a one-time fee.

How much does it cost for So Fresh and So Clean hourly?

Mathematical Equivalence

ON

Answer explanation

Look at where the line starts on the graph... what number is it at?