Question

If the graph of a straight line passes through the origin and the unit rate is $r,$ which of the following points will lie on the straight line?

• A. $(0,r)$
• B. $(3,r)$
• C. $(1,r)$
• D. $(2,r)$

Answer 1

The correct option is C $(1,r)$

Let’s look at the graph of a straight line.

Unit rate is defined as the value of the change in the y-coordinate, when the change in the x-coordinate is $1.$

Since this line passes through the point $(0,0),$ if the x-coordinate changes by $1,$ then we should get the y-coordinate as our unit rate $r.$

The point $(1,r)$ will lie on the straight line. For example, in the given graph, the straight line passes through the point $(1,2)$.


Therefore, the unit rate of the graph will be $2.$