Grade 8/9 question: Point A (0,1) and Point B (10,6) lie on a straight line. Find the equation of the line perpendicular to AB which also intersects B.
Gradient of AB: Change in Y/ Change in X .... (6-1)/(10-0) = 0.5Gradient of line perpendicular to AB: NEGATIVE (flip the sign) RECIPROCAL (flip the fraction) ... -2Equation of line perpendicular and intersecting B: Y = mX + c ... 6 = (-2 x 10) + c .... 6 = -20 + c ... c = 26Answer: y= -2x + 26
KR
Related Maths GCSE answers
All answers ▸how do you find the equation of a line perpendicular to another line at a point?
If x^2 + 2y = -14 and y = 4x + 1 , by using the quadratic formula, find the possible values for x.
Write x^2-4x+9 in the form (x-p)^2+q, where p and q are integers.
There are 7 blue pens, 4 green pens and 6 red pens in a box. One pen is taken at random from the box. Write down the probability that this pen is blue