Yes.
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If y(x) = 1/3x, y(-18) = 1/[3(-18)] = -1/54.
If: x = -5 Then: y = (3*-5)-1 = -16
-4
X - Y = 2 When X = 3 you have 3 - Y = 2 Moving Y to RHS: 3 = Y + 2 Moving 2 to LHS: 1 = Y
x = 3 y = 4 2x + y - 1 = (6) + (4) - 1 = 9