On a graph, this is a straight vertical line, parallel to the y-axis, passing through the point (a,0) on the x=axis. Its slope is infinite, and it has no y-intercept.
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x2 + y2 = 49
2/3.
5
y = - 1/3 x + any number.
When a straight line equation is parallel to another equation the slope remains the same but the y intercept changes