Question 99323
*[invoke calculating_slope 0, -3, -3, 0]
y= -x-3 slope=m= -1
slope of a line perpendicular to any line is its negative reciprocal: {{{m= -1/m[1]= -1/-1= 1}}}
the origin is point (0,0)
y-y[1]=m(x-x[1])
y-0=1(x-0)
so our equation for the in through the origin perpendicular to our 1st line is y=x
Ed
{{{graph(500,500,-10,10,-10,10,-x-3,x)}}}