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11. Show that these two lines are perpendicular and find their intersection points.
3y + 4x = 3
3
y = x – 2
4
= – 1
2
[5]
12. The following information refers to the equations of two straight lines, PQ and RS.
PQ: y – 6 = 2ax
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x y
RS: = 1 –
6b 3
Given that the straight lines PQ and RS are perpendicular to each other, express a in terms of b.
[4]
Cambridge IGCSE
TM
16 Ace Your Additional Mathematics
Chapter 2 Add Math (13 to 21).indd 16 14/03/2022 12:16 PM
