Help please. Harrison pours sand into a bucket at a constant rateA.y=3x+19B.y=4x+17C.y=4x-17D.y=2x+21

we can find the equation of line when given two points or a point and the gradient/slope.
In the above line we have two points (0,10) and (10,50),
The slope of the line is therefore 4
 Parallel lines have equal slopes or gradient, therefore the slope of the other line is still 4. And the line pases through a point (2,25), hence
Equation will be, (y-25)/(x-2) = 4
                           = y-25 = 4x-8
                           = y =4x +17
Thus the appropriate equation is y = 4x +17