To help draw a straight line graph from its equation, fill in a table of 𝑥 and 𝑦 values. Plot the pairs of values ... as point B, and using 𝑦B subtract 𝑦A over 𝑥B subtract 𝑥A ...

If you understand the definition of a mathematical function, a good way to judge it is that any line ... a scatter plot, whether you use it simply with marking points or lines, the graph is ...