Iphones cost $950 and cases cost $22.00. If your parents bought a total of 12 items for $3,976, how many Iphones did they buy?
x + y = 12
950x + 22y = 3976
From the first equation, we can solve for x in terms of y:
x = 12 - y
Substituting this into the second equation, we can solve for y:
950(12 - y) + 22y = 3976
11400 - 950y + 22y = 3976
-928y = -7424
y = 8
Substituting this back into the first equation, we can solve for x:
x = 12 - 8
x = 4
Therefore, your parents bought 4 iPhones.