Help please Find the slope-intercept form of the line that satisfies the given conditions.
Through A(3, 6) and B(−7, 8)

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.