First, we need to evaluate the function to get two points, and then we connect them with a line.
The linear function in the slope-intercept form is:
f(x) = a*x + b
Where x is the variable.
To graph it, we need to find two points on the line, to do that, we evaluate in two values of x. Let's use x = 0 and x = 1.
for x = 0:
f(0) = a*0 + b = b
for x = 1:
f(1) = a*1 + b = a + b
Then we have the points: (0, b) and (1, a + b).
Now we only need to graph these two points and connect them with a line, that line will be the graph of the linear function.
If you want to learn more about linear equations:
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