Algebra: Chapter 5 Review
Be ready for the test on Tuesday!
Math-8, Chapter 8-3, p 385
Graphing Linear Relations
We recall that the DOMAIN is the same as the X VALUES and the RANGE is the same as the Y VALUES. Linear equations HAVE NO EXPONENTS FOR THE VARIABLES > 1, so an equation like `y=x^2` is NOT A LINEAR EQUATION because the x values has an exponent >1, or in this example, 2.
To graph a linear equation, we make a T chart, fill in some student-friendly x data values (like, 0 , 1, 2 and 3) and solve for the y values. Just plug in 0, 1, 2, and 3 for x, solve for y and you now have ordered pairs of (x,y) that you can plot on graph paper.
Remember, to USE GRAPH paper for (x, y) linear equations. Connect the dots WITH A RULER and LABEL the x and y axes and the data values for (x, y).
IF THE DOTS DON’T LINE UP, then something is WRONG WITH YOUR DATA and you need to FIX IT.
Here are some examples from purplemath.com showing the T-chart and the graphing steps.