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What quadrant is the multiple choice function in mathematics? What's the point?
Look at two key numbers, k and b, y=kx+b:

B.b is the ordinate of the intersection of a straight line and the y axis. B<0, the intersection point is below the X axis; B=0, and the intersection point is at the origin; B>0, the intersection point is above the X axis.

Second, K.K. specializes in straight line (from left to right) rising or falling. K>0, straight up; K<0, straight down.

Such as y=2x- 1.

b =- 1 & lt； 0, the intersection point is below the x axis; K = 2>0, straight up. It can be judged that the straight line is in quadrant 1, 3, 4. Also called a straight line passing through 1, 3 and 4 quadrants. In other words, the straight line does not pass through the second quadrant.

Another example is y=-x- 1.

b = 1 & gt； 0, the intersection point is above the x axis; k =- 1 & lt； 0, straight down. It can be judged that the straight line is in 1, 2 and 4 quadrants.

If y=2x.

B=0, the straight line passes through the origin; K>0, straight up. Therefore, it is judged that the straight line is in the 1 and the third quadrant. Also called 1 and 3-quadrant straight line. Strictly speaking, the straight line passes through 1, quadrant 3 and the origin. Because the origin does not belong to any quadrant.

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