Question

Melanie charges $4.50 per hour when she washes cars, plus $5.00 for supplies. Which function rule represents the amount y Melanie charges to wash cars for x hours? (1 point)
a) y = 0.50x
b) y = 4.50x + 5.00
c) y = 5.00x + 4.50
d) y = 9.50x

The sale price of apples at a local grocery store is $1.35 for the first pound and $1.10 for each additional pound. Which function rule shows how the cost of apples, y, depends on the number of pounds, x?

a) y = 1.10(x – 1) + 1.35
b) y = 1.10x + 1.35
c) y = 1.35x + 1.10
d) y = (1.10 + 1.35)x

Answer 1

The first answer is b.

What do you think the second answer is?

Answer 2

If there's a constant term, that just plugs right in. Melanie always has $5.00 for supplies.

If there's a cost which is "per" unit, that is the slope of the line. Each new unit adds some fixed amount. Melanie gets $4.50 for each new hour worked.

So, y = 4.50x + 5.00

Do the other in like wise, but note that the first unit's cost is different from the others'.

Answer 3

can you show how you got the answer ?

Answer 4

thanks

Answer 5

the 2nd question is a ?

Answer 6

correct

Answer 7

Thanks this really helps!

Answer 8

Poosay

Answer 9

Which function rule represents the data in the table?
x -3, -2, -1, 0, 1
y -17, -14, -11, -8, -5

Answer 10

Which quadratic rule represents the data in the table?
x -1, 0, 1, 2, 3
y 6, 5, 6, 9, 14

Answer 11

A 154-lb person burns 420 calories per hour riding an exercise bike at a rate of 15 mi/h. Write a function rule to represent the total calories burned over time by that person. Explain how the information in the problem relates to the function.