A car is for sale for ₱400,000 in cash or on terms ₱200,000 down and ₱30,000 at the end of each month for the next 12 months. If you were the buyer, which purchase plan would you prefer? Money is worth 15% compounded monthly.

The linear equation is: y=ax+b

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.