[ y = plus or minus any number ] is parallel to the x-axis.
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x=4
In 2-dimensional co-ordinate geometry, a line parallel to the y axis has the equation x = c where c is a constant.
y=-2.5 is parallel to the x axis. The equation of the x axis is y=0
5
For a line to be parallel to the y-axis it must be a vertical line. therefore in order for the line to pass through the point (-1,5) you need to only be concerned with the x value of the point and your line would be x=-1.