Graphing Using Tables (continued)

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Presentation transcript:

Graphing Using Tables (continued)

Graph 2x + y = 4 using a table.

Graph 3x – y = 2 using a table.

Graph using a table.

Graphing LINEAR EQUATIONS are what we will focus on the next few weeks.

Characteristics of Linear Equations How can I look at an equation and know that it will form a line? 5 Characteristics No variable has an exponent other than 1 (Ex. 1) No variable is in absolute value (Ex. 2) No variables are multiplied together (Ex. 3) No variable in the denominator (Ex. 4) No more than 2 variable (Ex.: 2x + y + z = 9) If an equation passes these 5 things, it will form a line.

Graphing What do you notice about ALMOST any line you can draw on a graph? Intercepts occur when a graph hits either axis. X-intercept – where the graph crosses the x-axis Occurs when y = 0 Y-intercept – where the graph crosses the y-axis Occurs when x = 0

Graphing Using Intercepts If you know an equation is linear, you may find the x- and y-intercepts and use the 2 points to graph a line. Example: Graph 5x – 2y = 15 using intercepts.

Graph the following equation by finding the x- and y-intercepts.

Is the equation 4x - 5y = 8 linear? If so, graph it.

Is the equation 4x2 + 2y = 12 linear? If so, graph it.

What are the x- and y-intercepts of the equation 9x + 2y = -36?