Answer:
Equation is
where
denotes number of cups of orange juice needed by Sam.

Step-by-step explanation:
Let
denotes number of cups of orange juice needed by Sam.
Number of cups needed to make punch 
Number of cups with Sam 
Therefore,

What the formula?
::::::::::::::::::::::::::::::1
Answer:
9y + 4z + 9x
Step-by-step explanation:
Doesn’t let me in the link?
To find the slope from an equation, solve the equation for y.
The equation will have the form y = mx + b, called the slope-intercept form.
Then m = slope.
Let's solve your equation for y.

Subtract 2x from both sides.

Divide both sides by 7.


Now compare the equation above to y = mx + b.
m is the number that multiplies x, and it is the slope.