Which of the following function is not always true

Chose the graph below that represents the following system of inequality’s

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?