Chapter 9 Quadratic Relations and Conic Sections - 9.7 Solve Quadratic Systems - 9.7 Exercises - Problem Solving - Page 663: 41a

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We will use this formula $y=kx+l$ The two coordinates of Oak Lane are $(-2,1)$ and $(5,0)$ Substitute: $1=-2k-5k\\-7k=1\\k=-\frac{1}{7}\\ \rightarrow l=\frac{5}{7}$ The equation will be: $y=-\frac{1}{7}x+\frac{5}{7}$ The condition is $x^2+y^2\leq1$