Question
 If the point of intersection of the lines 2x + y = 11
and x - y = 1 is P(a, b), then the value of a + 2b is:Solution
ATQ, From x - y = 1 x = y + 1 Substitute into 2x + y = 11: 2(y + 1) + y = 11 3y + 2 = 11 3y = 9 y = 3 Then x = 4 So P(a, b) = (4, 3) a + 2b = 4 + 6 = 10
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