For a linear equation, that means the variable is to the power 1.
First you need two (2) points or a point and a slope (M).
To get points set the y variable = 0 to get the x-intercepts, that means where it cross on the x-axis.
To get the y-intercept set x = 0 the point on the y-axis.
If there is no intercept for one or the other axis then you need to slope.
Slope intercept form tells us that.
y = Mx + b
M is the slope and b is the y-intercept.
(0,b)