The equation of the straight lines CD and EF are 5x + y – 4 = 0 and . If CD and EF are parallel, find the value of h.
Two parallel lines have same gradient.
5x + y – 4 = 0
y = –5x + 4, mCD = –5
For the straight line EF,
The straight line has a y-intercept of 3 and is parallel to the straight line y + qx = 0. Determine the value of p and of q.
The equations of two straight lines y = 4x + 21. Determine whether the lines are perpendicular to each other.
Hence, the two straight lines are perpendicular to each other.