The x-axis is the horizontal axis so you want to know if y=-5x is a horizontal line.
The easiest way to check is to test a few points. For example if you plug in 0 for x, you get 0 for y. If you plug in 1 for x, you get -5 for y. Since you get different values for y, it isn't a horizontal line.
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-5
3y =18 y = 6 That is a line intercepting y axis at 6 but parallel to he x axis - there is no x intercept - it never crosses the x axis
The is a straight line parallel to the y-axis with an x intercept at -3.
Yes and it is a vertical straight line parallel to the y axis
A straight line 4 units below and parallel to the x-axis