Question
Plot the points $(2, 8), (7, 8)$ and $(12, 8)$. Join these points in pairs. Do they lie on a line? What do you observe?
✓
Answer
Take a point $O$ on the graph paper and draw the horizontal and vertical lines $OX$ and $OY$ respectively.
Then, let on the $x$-axis and $y$ axis $1$ cm represents $1$ unit.
In order to plot point $(2,8)$, we start from the origin $O$ and move 8 cm along $O X$. The point we arrive at is $(2,8)$.
To plot point $(7,8)$, we move $7 \ cm$ along $O X$ and 8 cm along $O Y$. The point we arrive at is $(7,8)$.
To plot point $(12,8)$, we move $12 \ cm$ along $O X$ and 8 cm along $O Y$. The point we arrive at is $(12,8)$.
From the graph below, it can be seen that the points lie on a line parallel to $x$-axis because they have the same $y$-coordinate.
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