Question
Which are at a distance of $9$ units from the Y – axis.
✓
Answer
Equations of the lines, which are parallel to the Y-axis and at a distance of $9$ units from it, are $x = 9$ and $x = -9$
i.e. $x – 9 = 0$ and $x + 9 = 0$
$\therefore $ their combined equation is
$(x – 9)(x + 9) = 0$
$\therefore x^2 – 81 = 0.$
i.e. $x – 9 = 0$ and $x + 9 = 0$
$\therefore $ their combined equation is
$(x – 9)(x + 9) = 0$
$\therefore x^2 – 81 = 0.$
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