You know that the force applied on a body is directly proportional to the acceleration produced in the body. Write an equation to express this situation and plot the graph of the equation.

(N/A) Here,the variables involved are force and acceleration. Let the force applied be $y$ units and the acceleration produced be $x$ units. From the concept of direct proportion,we can express this relationship as $y = kx$,where $k$ is a constant of proportionality. (From your study of science,you know that $k$ is actually the mass of the body.)
Since we do not know the specific value of $k$,we cannot draw a unique graph for $y = kx$. However,if we assign a specific value to $k$,we can draw the graph. Let us take $k = 3$,i.e.,we draw the line representing $y = 3x$.
To plot this,we find two solutions,for example,$(0, 0)$ and $(2, 6)$.
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 that when the force applied is $0$ units,the acceleration produced is $0$ units.