3. Because k is negative, the function image should be that y decreases with the increase of x, that is, y increases with the decrease of x, so y 1 is less than y2.

4. The intersection of (1) and Y axis X should be 0, so B(0, -3).

(2) There are two situations when it intersects with the X axis, one is on the positive semi-axis of X, and the other is on the negative semi-axis of X. It is known that a triangle with an area of 4 and a height of 3 should have a base of 8/3, so,

X(8/3，0)X(-8/3，0)

From the two cases of X, we can know that there are two cases of K (bringing X and Y into the calculation): k=-9/8 or 9/8.

I suggest you draw the function diagram yourself. I think so myself, but it should be right. Maybe k is not accurate.