Without an equality sign the given terms can't be considered to be a straight line equation.
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If you mean: 7y = -7(x-4) then y = -x+7 whereas -1 is the slope and 7 is the y intercept
Points: (8, 8) and (1, 2) Slope: (8-2)/(8-1) = 6/7 Equation: y-8 = 6/7(x-8) => 7y-56 = 6x-48 => 7y = 6x-48+56 Slope intercept form: 7y = 6x+8
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They are negative reciprocals. So if the slope of a line is x, the slope of the perpendicular line is -1/x
You can always find out the slope of a line by looking at the number before the variable. As you can see, there is no number in front of x, so how is there a slope? If X is ever alone, that means that there is one X, so the slope of the line is 1.