Question

Six years after a tree was planted, its height was 7 feet. Nine years after it was planted, its height was 16 feet. Which of the following equations gives the height y, in feet, of the tree after x years if the tree grows at a constant rate? Check all of the boxes that apply.
A) y – 6 = 3(x – 10)

B) y – 16 = 3(x – 9)

C) y = 3x – 11

D) y = –3x – 23

Answer 1

It is 
y-16=3(x-9)
y=3x-11 
b & c

Answer 2

Answer:

B & C

The rest of the assignment here

Part 6 : C

Part 7 : y = 4x + 19

Part 8 : 1/2 , -10 (They try to trick you here with a + sign, make sure to add the negative symbol)

Part 9 :

The answer is 12x + y = 185

The common formula for a two variable linear equation is: ax + by = r

The lab starts with 185 dishes which is y-intercept:

ax + by = 185

The number of dishes used per day is 12 which is slope:

12x +by = 185

Therefore, the two variable linear equation for this example is 12x + y = 185.

Part 10 :

To solve for the variable cost:

11 - 5 = 6

3.24 - 2.70 = 0.54

0.54 / 6 = 0.09 per print

To solve for the fixed cost

0.09 x 5 = 0.45

2.70 - 0.45 = 2.25 

y = 2.25 + 0.09x

y = 2.25 + 0.09(5) = 2.25 + 0.45 = 2.70

y = 2.25 + 0.09(11) = 2.25 + 0.99 = 3.24

y = 2.25 + 0.09(20) = 2.25 + 1.8 = 4.05

Hope I helped you out!