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2x - 4 = y
y = -2x
2x - 4 = -2x
4x = 4
x = 1 ; y = -2
Hp = {1,-2}
b. y = x + 1 >>>Masing" ruas kali 3
3y = 3x + 3
3y - 2x = 6
3x + 3 - 2x = 6
x + 3 = 6
x = 3 ; y = 4
Hp = {3,4}