NumericalEasy1 mark
3(iii)
In the given graph ABCD is a parallelogram. Using the graph, answer the following:
find the equation of the diagonal AC.
Topic: Slope / equation of line
Previous-year question practice database
Answer
Exam answer
A(3,3), C(−4,−2).
mAC = [3−(−2)]/[3−(−4)] = 5/7.
Through A(3,3): y−3 = (5/7)(x−3)
7y−21 = 5x−15 5x−7y+6 = 0.
Answer: 5x − 7y + 6 = 0.
Explanation
Find the slope of AC, then use point-slope form with point A.
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