20) The Everton College store paid $1804 for an order of 48 calculators. The store paid $9 for each scientific calculator. The others all graphing calculators cost $58 each. How many of each type of calculator was ordered?

Question

amistre64 · Answer

c@9 = (1804 - 48(9))/(58-9) maybe .... i always get this one confused

anonymous · Answer

solve 
$$9x+58(84-x)=1804$$ so get your answer

anonymous · Answer

sensei always does it in one step.  probably right

anonymous · Answer

anyway what i wrote was wrong.  solve 
$$9x+58(48-x)=1804$$

amistre64 · Answer

lets see if im right :)

28(9) + 20(58) ?= 1804

252 + 1160 ?= 1804

1412!=! 1804 ... might got em backwards then ...

amistre64 · Answer

yep; had em backwards lol

anonymous · Answer

reasoning as follows.  x is number of $9 for a total of 9x dollars. if x are $9 calculators then the rest (48-x) cost $58 for a total of 58(48-x) dollars.

anonymous · Answer

therefore one expression for the total is 
$$9x+58(48-x)$$ and the other expression for the total is $1084 because you are told that

anonymous · Answer

so set 
$$9x+58(48-x)=1084$$ and solve for x

amistre64 · Answer

1804 .. but yeah

amistre64 · Answer

b@y = (z -t(x))/(y-x)


amount@58 = (1804 - 48(9))/(58-9)