
Keith H. answered 03/07/18
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Hello,
The equation x=-7 is a completely vertical line that passes through all y values but maintain a x position of -7. Therefore, anything parallel to it will also be a vertical line with similar properties. However, we need a vertical line that passes through (-9,7). To achieve, this we need an equation of x=? since x equations produces vertical line and they also include all y values, so it will pass through y of 7. So the answer is x=-9, since the x position of the point is -9. Hope this helps!