Cara os making potato salad for a cook out. one serving of potato salad has 1 1/2 cups of cooked potatoes and 1/4 cup of mayonnaise. how many cups of potatoes would be needed if cara uses 3 1/4 cups of mayonnaise?

19.5

Step-by-step explanation:

just look at the equation like this

1 1/2 - 1/4

- 3 1/4

divide 3 1/4 by 1/4 and multiply the result by 1 1/2

or just treat it as a ratio

1.5/x=.25/3.25

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18