I think the answer would be A. But double check with the graph I posted.
Step 1:
Set Variables (We will use x & y)
x = years
y = total orangutan population
Step 2:
Set up Equations
784 - 25x = y
817 - 36x = y
Step 3:
Set equations equal to each other & solve
784 - 25x = 817 - 36x
784 = 817 - 11x
-33 = -11x
3 years = x
First we need to find the number they started with.
(x+7)*2=26
Solve for x
x+7=13
x=6
To do the operations in reverse, we double it first and then add 7.
6*2=12
12+7=19
Final answer: 19
