5-7 ax + by = c form miss battaglia – algebra 1 cp objective: graph equations using x- and y-...
TRANSCRIPT
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WARM UPThe choir director offers to stop at a fast food restaurant with 60
students after a performance. A discussion reveals that 35 students like cheeseburgers, 37 like pizza, 36 students like tacos, 22 students like cheeseburgers or pizza, 18 students like pizza or tacos, 23 students like tacos or cheeseburgers, and 15 students like all three choices. How many students like only one of the three fast food choices?
GRAPHING EQUATIONS
Ax + By = C Form of a Linear Equation
Ax + By = C is a linear equation, where A and B cannot both be zero.
3x + 4y = 8
To make a quick graph, you can use the x- and y-intercepts. The
x-intercept is the x-coordinate of the point where a line crosses the x-axis.
GRAPH
3x + 4y = 8Find the x- and y-intercept
FIND THE X- AND Y-INTERCEPTS OF EACH EQUATIONa. 3x + 4y = 12 b. 2x – y
= 4
GRAPH ON A GRAPHING CALCULATOR
5x – 3y = 120
Step 1: Write the equation in slope-intercept form.
Step 2: Find the x- and y-intercepts.
Step 3: Set the ranges to include the x- and y-axes and the intercepts. Then graph!
FITNESS
When you jog, you burn 7.3 calories/min. When you run, you burn 11.3 calories/min. Write an equation to find the times you would need to run and job in order to burn 500 calories.
EXAMPLE
Write an equation of the line with the slope - through the point (-1,7)
EXAMPLE
Write an equation of the line with the slope - through the point (4,2)
HOMEWORK
Pg 248-249 # 1, 4 – 7, 12a, 13, 14a, 20 – 22