Question

Annika sells 6 inch pies for $5.00 and 8 inch pies for $9.00 each. Last week she sold twice as many 6 inch pies as she did 8 inch pies. She made $133.00 from her sales. Annika defined x as the number of 6 inch pies she sold and y as the number of 8 inch pies she sold.

Answer 1

The question is
Find the values of x and  y

Let
x---------> the number of 6-inch pies Annika sold 
y--------> the number of 8-inch pies Annika sold 

we know that
x=2y------> equation 1
5x+9y=133---> equation 2
substitute the equation 1 in equation 2

5*[2y]+9y=133
10y+9y=133
19y=133
y=7
x=2y-----> x=2*7-----> x=14

the answer is
the number of an 6-inch pies is 14
 the number of an 8-inch pie is 7