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= 1/2x + 3
a. = + 4
= 1/2( + 4) + 3
= 1/2x + 2 + 3
= 1/2x + 5
- = (1/2x + 5) - (1/2x + 3)
- = 2
b. = - 6
= 1/2( - 6) + 3
= 1/2x - 3 + 3
= 1/2x
- = (1/2x) - (1/2x + 3)
- = -3