Question 344424
The line {{{y=x-3}}} has a slope of {{{1}}} and makes a {{{45}}} degree angle with the x-axis. A line perpendicular to it would make an additional 90 degree angle with the x-axis.
{{{A=45+90=135}}}degrees
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{{{graph(300,300,-2,8,-5,5,x-3,-x+3)}}}