Group the following lines into sets that are perpendicular.
a. y = −1
b. x = −2
c. y = 2x + 3
d. y = 3x + 5
f. y = x − 3
g. y = −x + 1
h. y = −3x − 7
i. x + 3y = −5
j. x + 2y = −1
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