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Perpendicular Lines and the equation of a tangent

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Question 10

Here are the equations of 5 straight lines.

P:y=2x+5 P: y = 2x + 5 P:y=2x+5 Q:y=−2x+5 Q: y = -2x + 5 Q:y=−2x+5 R:y=x+5 R: y = x + 5 R:y=x+5 S:y=−12x+6 S: y = -\frac{1}{2}x + 6 S:y=−21​x+6 T:y=12x+1 T: y = \frac{1}{2}x + 1 T:y=21​x+1
a.

Write down the letter of the line that is parallel to y=x+6y = x + 6y=x+6

[1]
b.

Write down the letter of the line that is perpendicular to y=2x−1y = 2x - 1y=2x−1

[1]

Perpendicular Lines and the equation of a tangent Questions

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