If you mean: y = -3x then the slope of the line is -3
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Solve the line equation for "y", to get it in slope-intercept form. You can immediately read the slope from this equation.Divide -1 by (slope of this first line) to get the slope of the second line - the one perpendicular to the given line. Write an equation for any line with this slope.
Without an equality sign the expression given can't be considered to be a straight line equation
As for example in the straight line equation of y=3x+5 the slope is 3 and the y intercept is 5
y = 3x/4 + 7
x - 4y = 3 is the slope of a line perpendicular to line whose equation is y -5 3x plus 8 3.