Question 864440
1.{{{x^2+y^2= 153}}}
2.{{{y = -4x}}}
From eq. 2,
{{{y^2=16x^2}}}
Substitute into eq. 1,
{{{x^2+16x^2=153}}}
{{{17x^2=153}}}
{{{x^2=9}}}
{{{x=0 +- 3}}}
When {{{x=3}}},{{{y=-12}}}
When {{{x=-3}}},{{{y=12}}}
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{{{drawing(300,300,-15,15,-15,15,grid(1),blue(circle(0,0,sqrt(153))),
circle(3,-12,0.5),
circle(-3,12,0.5),
graph(300,300,-15,15,-15,15,-4x))}}}