Answer:
The answer is B.
3x + 5y = 24
4x + 3y = 21
Explanation:
x = cost of a chocolate chip cookie
y = cost of an oatmeal cookie
3x + 5y = 24
4x + 3y = 21
Lets solve:
-3(3x + 5y = 24) ==> -9x - 15y = -72
5(4x + 3y = 21) ==> 20x + 15y = 105
Let's add our new equations:
-9x - 15y = -72
20x + 15y = 105
11x = 33
/11 /11
x = $3.00 (the cost of each chocolate chip cookie)
Now lets find the cost of each oatmeal cookie using one of our original equations: 3x + 5y = 24
3(3) + 5y = 24
9 + 5y = 24
-9 -9
5y = 15
/5 /5
y = $3 (the cost of each oatmeal cookie)
Each type of cookie (chocolate chip and oatmeal), costs $3.00
Hope that helps!