At a candy store. Erika bought 3 kilograms of cinnamon red hots and 1 kilogram of gummy bears for $21.00. Meanwhile, Irene bought 3 kilograms of cinnamon red hots and 3 kilograms of gummy bears for $39.00
What is the cost of one kilogram of each type of candy?
Red hots
Gummy bears

answer: you have to make a system of equations.

lets make the cost of gummy bears per kg b and the cost of cinnamon red hots per kg c.

3c+1b=21

3c+3b=39 

-3c-b=-21 (multiply one of the equation by -1 so that we can cancel out c)

3c+3b=39

2b=18

b=9 dollars per kilogram

to find c you can plug the value of b back into one of the equation above and (3c+9=21 which lead to 3c =12 so c=4 dollars per kilogram.

I hope this helps. 

Cinnamon Red Hots, $9 per kilogram

Gummy Bears, $4 per kilogram

7,24

step-by-step explanation:

x-3y=4

step-by-step e