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Equ. #1:

Equ. #2:

Equ. #3:

Equ. #4:

Equ. #5:

Equ. #6:

Equ. #7:

Equ. #8:

Equ. #9:

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Dependent Variable

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Ineq. #1:

Ineq. #2:

Ineq. #3:

Ineq. #4:

Ineq. #5:

Ineq. #6:

Ineq. #7:

Ineq. #8:

Ineq. #9:

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Linear Equations

Different y-intercepts and Zero Slope

Example 1 - Different y-intercepts

y = Â½x + 1
x	y
0	1
1	1Â½
2	2
3	2Â½
4	3

y = Â½x + 3
x	y
0	3
1	3Â½
2	4
3	4Â½
4	5

Notice that changes to b (y- intercept) will raise or lower the line. Lines with the same slope are always parallel - they never cross or intersect.

Example 2 - Zero slope

y = 3

x	y
0	3
1	3
2	3
3	3
4	3

The equation y = 3 can also be written as y = 0x + 3. This has a slope of zero, and results in a horizontal line on the graph.