Whats x-y=-3 and whats 2x+y =12

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?