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Verified answer
1).a. f(x) = 1/2 x +2/3
misal y = 1/2 x +2/3
1/2x = y - 2/3
x = 2y - 4/3
f^-1(x) = 2x -4/3
b. f(x) = (1-2x)/(4-x)
misal y = (1-2x)/(4-x)
y (4 - x) = 1 - 2x
4y - yx = 1 - 2x
2x - yx = 1 - 4y
x (2 - y) = 1 - 4y
x = (1 - 4y)/ (2 - y)
f^-1(x) = (1 - 4x) / (2 - x)