Question

A line has a vertical change per unit of horizontal change of negative two-fifths and passes through point one comma one. Which is another point on the line?

Answer 1

Vertical change per unit of horizontal change is the gradient.
Use the formula
y = y1 + m(x - x1) where m is the gradient and (x1 , y1) is a point on the line, then substitute the coordinates of the other point to see if it lies on the line