Itake the bus to the libary after school and travel 3 miles, then my mom pics me up and we travel 4 miles home . how far do i live from my school

This is most like a pythagorean triple triangle and the triple being 3-4-5, you would like 5 miles from the school.

I'm pretty sure its 7. You drive 3 miles to school from the library. Its 4 miles home from the library. If you take the miles driven from library to school, and add the miles driven from library to home, it would be 7 miles from school to home.

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for