Is it possible for a line ax+by=c to lack a y-intercept? to lack an x-intercept

Y=4x^2+x-1 solve using quadratic formula

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?

Put the following steps for calculating net worth in the correct order