Question

Tell whether the lines for each pair of equations are parallel, perpendicular, or neither: y = -2x + 4 and
-5x + 10y = 5

Answer 1

Try rearranging the 2nd equation to the same form as the 1st one.

Answer 2

I get y= 1/2x + 5

Answer 3

Ok, so what are the 2 gradients?

Answer 4

If they are the same, they are parallel. Product equal to -1 they are perpendicular.