Question

The equation y =8x+ 12, where x is the number of hours

and y is the total cost, represents what the surf instructor
charges for lessons. Use this information to describe how
to draw the line on a graph.

Answer 1

sample response:

Use the rise/run strategy to draw the line. Start at the y-intercept (0, 12), and count 8 up and 1 to the right to the point (1, 20). Then, draw a line through the points. Test the point (3,36) in the equation y = 8x + 12 to verify that the line is correct.

Answer 2

Plot a number of hours against total cost graph.

(1) by y=mx+c

The line with slope of 8 and y-intercept is 12.

The other way to plot a graph is put some integer into x to find out y, vice versa.For example when y=12,

x is equal to 0.

when y= 20,

x is equal to 1.

You can find out 3 point and join the line.

Finally the graph is finished.

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