If you mean y = 3x then the slope is 3 and there is no y intercept
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Equation of given line: 3x + y = 15 or y = -3x + 15 Slope of given line = coefficient of x = -3 Slope of perperndicular = -1/(slope of given line) = -1 / (-3) = 1/3
-1
Do you mean: y = -3x+5 then if so the slope is -3 and the y intercept is 5
It is the slope of the line as for example y=3x+6 whereas 3 is the slope and 6 is the y intercept.
The equation in point slope of the line which passes through -2 -3 and is parallel to 3x plus 2y 10 is y=-1.5x.