The equation of the tangent to the curve y2 = 10 - 5x parallel to the line 10x + 8y + 221 = 0 is
5x - 4y - 14 = 0
5x + 4y + 14 = 0
x - y + 2 = 0
4x - 5y + 14 = 0
how is 5x-4y-14 parallel to 10x+8y+221