A road that is two miles long is divided into three equal sections what was the length of each section

Line cd passes through points c(1, 3) and d(4, –3). if the equation of the line is written in slope-intercept form, y = mx + b, what is the value of b? –5 –2 1 5

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Suppose a gym membership has an initial enrollment fee of $75 and then a fee of $29 a month. which equation models the cost, c, of the gym membership for m months?