Draw the image of function y = 3x-15, observe the image and answer: when x = what value, y = 0? Y > 0? Y < 0? Must be a graph,

x=5,y=0x>5,y>0x<5,y<0

Draw the image of the function y = - 3x + 15, and use the image:
1. Finding inequality-3x + 15
If the value of the function y is in the range of 9 ≤ y ≤ 9, this step is wrong. What is correct is if the value of the function y is in the range of - 9 ≤ y ≤ 9
There is another question, in the same rectangular coordinate system, make the image of function Y1 = 3x-2 and function y2 = 2x + 3, and answer according to the image: 1. When x is what value, Y1 = Y2; 2. When x is what value, Y1 > Y2; 3. When x is what value, Y1 = Y2

1. The function y = - 3x + 15 is a straight line, which intersects with y axis (0,15) and X axis (5,0)
1) Inequality-3x + 155
The right part of point (5,0) on the x-axis;
2) -92x+3==>x>5
When x > 5, Y1 > Y2
That is X

In the isosceles triangle ABC, the coordinates of point A.B are (4.0), (0,3) respectively. On the coordinate axis of point C, the coordinates of point C are
Write down all the possibilities

There are eight points, ab = 5ab as the waist, B as the center, AB length as the radius, draw arc intersection Y-axis two points, these two coordinates are (0. - 2), (0,8) intersection x-axis and (- 4,0) AB as the waist, a as the center, AB length as the radius, draw arc intersection X-axis two points, these two coordinates are (- 1.0), (9,0) intersection y-axis in (0, - 3) with ab as the bottom, do

In Cartesian coordinates, if the area of an isosceles right triangle with the vertex of origin o is 5 / 2 -- down?
In Cartesian coordinate system, if the area of isosceles right triangle with origin o as vertex is 5 / 2, and the vertices of triangle are all on integer points, such triangle has the following advantages_____ One
I think there are more than eight, because I think the vertex in the topic is the three vertices of a triangle, and each vertex can be at the origin,

In Cartesian coordinate system, if the area of isosceles right triangle with origin o as vertex is 5 / 2, and the vertices of triangle are all on integer points, such triangle has the following advantages__ The length of the side is a root, 5 has 8__ One

For any real number x, compare the size of 3x2 + 2x - 1 and X2 + 5x - 3

(3x2 + 2x-1) - (x2 + 5x-3) = 2x2-3x + 2 = 2 [x2-32x + (34) 2] - 98 + 2 = 2 (X-34) 2 + 78 ＞ 0, that is, (3x2 + 2x-1) - (x2 + 5x-3) ＞ 0, 3x2 + 2x-1 ＞ x2 + 5x-3

Draw the image of function y = 3x-15, observe the image and answer: when x = what value, y = 0? Y > 0? Y < 0? Must be a graph,