Froyo is $2.35
Let's call Hailey's lunch x, her sister's lunch y, and the froyo z.
x=6.75
y=5.95
z=?
x+y+2z= 17.40 Now subsitute:
6.75 + 5.95 + 2z = 17.40 Next combine like terms:
12.7 + 2z = 17.40 Then isolate z.
-12.7 -12.7
2z= 4.7
divide by 2 on both sides
z=2.35
froyo is $2.35
