yes And at right angles (90deg) to the horizontal plane
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If the slope is undefined, then its a vertical line (up and down) .So draw a vertical line (up and down) that goes through -2 on the x-axis.
Yes. Vertical means up (or down).
When the coefficient is positive, the line goes up and to the right.
It extends in both directions (up and down) such that it is parallel to the y-axis.