Help with solving and graphing?

Remember that all ordered pairs are of the form (x, y) meaning the first number, x, tells you how many units you move right or left from the origin. The second number, y, tells you how many units to move up or down from the origin. So for (0, -1), you move 0 units left and right, and 1 unit down because it is negative.

For future reference, there is a button on your keyboard labeled PrtScn (usually near the top). If you press it, it takes a snapshot of your computer screen. You can then paste it in Microsoft Paint to get a better picture of your screen without the glare.

From the plot, it looks like m = -2 and y-intercept = -1

Check using twp points:

m = (y2 - y1)/(x2 - x1) = (-9 - (-1))/(4 - 0) = -8/4 = -2

using point (0,-1):

y - y1 = m(x - x1)

y + 1 = -2(x - 0) in point-slope form

y + 1 = -2x

y = -2x - 1 in point-slope form <===

confirms that slope is -2 and y-intercept is -1.