Question

Can someone explain what 2 do for these 2 problems please?

Answer 1

27) These lines are perpendicular since

their slopes are negative reciprocals

(-3 × 1/3 = -1).

29) 15x - 5y = 10

3x - y = 2

-y = -3x + 2

y = 3x - 2

So these lines are parallel since their

slopes are the same.