Question

The expression −50x+100 represents the balance, in dollars, of a bank account after x months.

Answer 1

the answer is -50  dollars per month

I did it on a test and got 100%

Answer 2

Basically get two slopes -50(1)+100 will get you 1,50 (1 is x and 50 is y since its the answer)
-50(0)+100 (0,100)  Y₂-Y₁/X₂-X₁ 50-100/1-0
Rate of change per month = -$50