Answer:
I believe it is C) decreasing when x > -1
Step-by-step explanation:
If you plot all 3 points on a graph, you will notice that the parabola is facing downwards. This means that on the left side of the vertex, it is increasing (the y-value increases). On the right side of the vertex, it decreases (y-value decreases). Note that "decreasing" refers to the y values.
So, since the vertex's x-value is -1 (we know this from the point (-1, 2)), any x-value greater than -1 will be to the right of the vertex. For example, 0, 1, 2, 3, etc. are all greater x-values than -1, so they are all to the right of -1. Since they are on the right, that means the corresponding-values will be decreasing.
Therefore, when x > -1, the parabola is decreasing.
Answer:
y = -2.5x + 5
Explanation:
Convert -5x - 2y = -10 into slope-intercept form: y = -2.5x + 5
You can start solving for and graphing points by putting numbers in for 'x' in the equation, and the answer you get out will be y.
Ex: -2.5(7) + 5 = -12.5
7 is the number we inserted for x, so it is the x value. -12.5 is the number we got out of the equation, so it is the y value.
The points will now look like this: (x, y) but for the example they would look like (7, -12.5)
Plot the numbers, x being on the horizontal axis, y being on the vertical axis.
