A vending machine sells chips at $0.55 and candy at $0.75 . Last month, the vending machine yielded $189.00 with the sale of 280 items

Question

darkknight · Answer

f for chips
c for candy
.55f + .75c = 189
f + c = 280

darkknight · Answer

do u understand how i got those 2 eqns?

angelique27 · Answer

no

angelique27 · Answer

whats the answer

darkknight · Answer

the cost function is one eqn, the amount of items total is another

darkknight · Answer

i am trying to help you get the answer

angelique27 · Answer

ok thanks

angelique27 · Answer

so what do i do to find the answer

darkknight · Answer

i gave u 2 eqns, first do u get how i got them?

angelique27 · Answer

yes

darkknight · Answer

nice
now 
.55f + .75c = 189
f + c = 280
c = 280-f
now we can use substitution

darkknight · Answer

.55f + .75(280-f) = 189
i plugged in the value for c so that our eqn is in terms of f

darkknight · Answer

now i would like you to solve for f

angelique27 · Answer

you multiply 75 with 280 right?

darkknight · Answer

.75

darkknight · Answer

you have to distribute within the parenthesis

angelique27 · Answer

$210.55=189 right?

darkknight · Answer

?

darkknight · Answer

check your math, you should be solving for f

angelique27 · Answer

i did

angelique27 · Answer

nvm this is too hard

darkknight · Answer

no it isn't u got this
.55f + .75(280-f) = 189
you have to solve for f, just distribute and combine like terms

ZombieLover · Answer

Close when done :)