If you have an equation with no y intercept, what do you automatically assume the y intercept to be .?

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

6x - 8 = 16 solve the following equation. then place the correct number in the box provided.

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.