the computer club went on a feild trip to a computer museum. The trip cost $240 to be paid equally by each club member. The day before the trip, 4 students decided not to go. This increased the cost by $2 dollars per student . How many students went to the computer museum?

Question

anonymous · Answer

if you let x = initial number of students who went to the museum
y = initial cost of trip per student

240 = xy  (1)
240 = (x-4)(y+2)   (2)

solving to equation will lead solving x and y.... but we need x-4, the final number of students who went in museum

anonymous · Answer

@Orion1213 how do you solve the 2nd equation?

anonymous · Answer

you have 2 equations 1 and 2, and 2 unknowns... solving them simultaneously will lead you either to solve x or y first... then the other can be solve using either 1 or 2, once you plug-in the first one you have obtained...

anonymous · Answer

for equation 1... you can re-write it as...$$y=240/x$$and substitute or plug-in at equation 2 as...$$240=(x-4)(240/x +2)$$here you can solve the original number of students...

anonymous · Answer

hope you can make it from here...

anonymous · Answer

yeah. thank you