It looks like you wrote the equation in point-slope form perfectly!
But for part c, it seems as though x1 and y1 would represent parts of the midpoint formula. So, I would specify and say that they represent the midpoint, not just a point.
<span>the discriminant D of the equation 3g² + 15g + 10 = 0 for a quadratic equation ax²+bx+c=0 the discriminant D is D= b²-4xaxc so for </span><span> 3g² + 15g + 10 = 0 D=15²- 4x3x10=125-120=5, so D=5</span><span>