Mr. Rifkin had 240 digital and manual cameras. After donating 82 digital cameras and 26 manual cameras, he had 3 times as many digital cameras as manual cameras left. How many digital cameras did he have at first?

  181

Step-by-step explanation:

Let d represent the number of digit cameras Mr. Rifkin had at first. Then 240-d is the number of manual cameras he had. The after-donation numbers are ...

  (d -82) . . . digital cameras after donating 82

  (240 -d) -26 . . . manual cameras after donating 26

These values are related by ...

  (d -82) = 3((240 -d) -26)

  4d = 724 . . . . . add 3d+82 and simplify

  d = 181

Rifkin had 181 digital cameras at first.

Check

Rifkin started with 181 digital cameras and 59 manual cameras. After donation, he had 99 digital cameras and 33 manual cameras, so 3 times as many digital as manual—as required.

answer: (1,3) and (-2,0) i think.

could

step-by-step explanation:

u send me a picture of ur work