The Everton college store paid $1813 for an order of 45 calculators. The store paid $10 for each scientific calculator. The others, all graphing calculators cost the store $57 each. How many of each type of calculator was ordered?

Question

anonymous · Answer

let the number of scientific calculators be x and number of graphing calculators be y

x+y=45
10x+57y=1813

solve for x and y

anonymous · Answer

how do I solve it?

anonymous · Answer

x+y=45 ------------(1)
10x+57y=1813--------(2)

multiply 1st equation by 10

10(x+y=45)------->10x+10y=450

subtract 1st equation from 2nd equation

 10x+57y=1813
-10x-10y=-450
---------------
47y=1363
y=1363/47
y=29

now plug y value into one of the equation

x+29=45
x=45-29
x=16

therefore,number of scientific calculators=16
and number of graphing calculators=29

anonymous · Answer

OOOHHH okay, thank you :D