Here are the equations of 5 straight lines.
P: y = 2x+5
Q: y = -2x+5
R: y = x+5
S: y = -1/2x+6
T: y = 1/2x+1
(a) Write down the letter of the line that is parallel to y=x+6
(b) Write down the letter of the line that is perpendicular to y = 2x - 1 ​

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