Question 378281
{{{x^2+y^2=81}}} is a circle centered at (0,0) with a radius of 9.
{{{drawing(300,300,-12,12,-12,12,graph(300,300,-12,12,-12,12,sqrt(81-x^2)),graph(300,300,-12,12,-12,12,-sqrt(81-x^2)))}}}
and
{{{-5x+5y=-25}}}
{{{5y=5x-25}}}
{{{y=x-5}}}
is a line with an x-intercept of ({{{5}}},{{{0}}}) and a y-intercept of ({{{0}}},{{{-5}}}).
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{{{drawing(300,300,-12,12,-12,12,graph(300,300,-12,12,-12,12,x-5),graph(300,300,-12,12,-12,12,sqrt(81-x^2)),graph(300,300,-12,12,-12,12,-sqrt(81-x^2)))}}}
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*[invoke plot_any_inequality "x^2+y^2<=81", -12, 12, -12, 12, 300, 300]

*[invoke plot_any_inequality "-5x+5y<=-25", -12, 12, -12, 12, 300, 300]
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The solution region is then the section contained within the circle and below the line.

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