Algebra

10. Write an equation in point-slope form for the line through the given point with the given slope.
(5, 2); m=3

a. y+2=3(x-5) ***
b. y+2=3x-5
c. y-2=3(x+5)
d.y-2=3(x-5)

11. Write an equation in point-slope form for the line through the given point with the given slope.

(-10,-6); m=-5/8
a. y-6=-5/8(x-10)
b. y-6=-5/8(x+10)
c. y+6=-5/8(x+10) ***
d. y+10=-5/8(x+6)

14. Write y=(-3/4) in standard form using integers

a. 3x+4y=12
b. 3x+4y=-12
c. 3x-4y=12
d. -3x+4y=12 ***

24. You use a line of best fit for a set of data to make a prediction about an unknown value. The value correlation coefficient for your data set is -0.015. How confident can you be that your predicted value will be reasonably close to the actual value?

25. A college football coach wants to know if there is a correlation between his players' leg strength and the time it takes for them to sprint 40 yards. He sets up the following and records the data.

Every day for a week: counts how many times each player leg press 350 lbs

following week: 40 yd sprint each day

Table shows average number of leg-press & yard dash time for 7 players

What is the equation of best fit?
How many seconds should be expect a player to take to run 40 yards if that player can do 22 leg-press repetitions? Round any values to the nearest tenth, if necessary.

Leg Press (reps) 15 - 18 - 8 - 30 - 26 - 12 - 21
40-yard Dash (s) 5.2 - 6.3 - 6.8 - 8.2 - 8.0 - 5.3 - 5.9

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  1. #10 wrong -- see #11
    #11 right
    #14 has a typo, but I'm pretty sure you're wrong.
    #24 what does a tiny correlation coefficient mean?
    #25 use your favorite best-fit line tool. Many online.

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  2. @steve im not sure

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