Busan Haeundae education special zone high school math question
Straight line f (x, y) = 0 and the coordinates of point 
is shown below. More than just below the figure below. The value of the following is the largest?(4.6 points)
Answer 4), Multiplying the equation to the boundary between the opposite side comes negative number. Boundary is zero. Therefore, black hole of zero is negative, a positive number multiplied by zero sucks too.
So, No.1 is negative number, and 2 is 0, 3 is negative number, and 4, positive number, 5 is negative number
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