Exercise #1: In each case below, a pair of values has been given for two proportional variables. For each do the following: (1) give an equation for y in terms of r and (2) find the missing value
for y using that equation.
(a)
x= 4, y = 12
(b)
x=10, V= 5
(c)x=6,y=10
+=2, y=?
x=16, y=?
r =9, V=?

Step-by-step explanation:

 X = $1.50

Step-by-step explanation:

Let x = the cost of a granola bar

Let y = the cost of a cup of yogurt

10x + 6y = 18    Divide both sides of this equation by 2.

5x + 3y = 9

The second equation is 5x + 4y = 9.50. Now subtract the two equations.

5x + 4y = 9.50

-5x - 3y = -9

         y = $.50

5x + 3(.50) = 9

5x + 1.50 = 9

5x = 7.5

x = $1.50