-9
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First rewrite the equation in the standrad form: y = mx + c. Then m is the slope.
So, -2x-y = 7 gives y = -2x -7 and the slope is -2.
Slope for the equation y equals 7 is zero.
2xy=2*30*2=120
The slope is 4.4 and the y intercept is -7
7
If: y = 7 then there is no slope and the line will be parallel to the x axis