आप जानते हैं कि एक पिंड पर लगाया गया बल पिंड में उत्पन्न त्वरण के अनुक्रमानुपाती होता है। इस स्थिति को व्यक्त करने वाला एक समीकरण लिखिए और समीकरण को आलेखित कीजिए।

Here the variables involved are force and acceleration. Let the force applied be $y$ units and the acceleration produced be $x$ units. From ratio and proportion, you can express this fact as $y = kx$, where $k$ is a constant. (From your study of science, you know that $k$ is actually the mass of the body.)

Now, since we do not know what $k$ is, we cannot draw the precise graph of $y = kx$. However, if we give a certain value to $k$, then we can draw the graph. Let us take $k = 3$, i.e., we draw the line representing $y = 3x.$ 

For this we find two of its solutions, say $(0,\, 0)$ and $(2,\, 6)$ (see Fig.).

From the graph, you can see that when the force applied is $3$ units, the acceleration produced is $1$ unit.Also, note that $(0,\, 0)$ lies on the graph which means the acceleration produced is $0$ units, when the force applied is $0$ units.