Problema Solution
Paid $1,674.00 for 47 calculators. Scientific model cost $10.00 and graphing model cost $53.00. How many of each model were purchased?
Answer provided by our tutors
set up 2 equations
x+y = 47
10x + 53y = 1674
x = 47-y from first equation, substitute into second
10(47-y) + 53y = 1674
470 - 10y + 53y = 1674
470 + 43y = 1674
43y = 1204
y = 28
x = 47-y = 47-28 = 19
so there were 19 scientific calculators purchased and 28 graphing calculators purchased