Sketch the circle given by x²+y²=1 and the line given by y=2x+2 on the same set of axes. One solution to the pair of equations is easily identifiable from the sketch. What is it?

Answer :

Answer:

(-0.6, 0.8) and (-1,0)

Step-by-step explanation:

[tex]x^2+y^2=1[/tex]

[tex]y=2x+2[/tex]

Applying y value to the first equation

[tex]x^2+(2x+2)^2=1\\\Rightarrow x^2+4x^2+4+8x=1\\\Rightarrow 5x^2+8x+3=0[/tex]

Solving the equation

[tex]x=\frac{-8+\sqrt{8^2-4\cdot \:5\cdot \:3}}{2\cdot \:5}, \frac{-8-\sqrt{8^2-4\cdot \:5\cdot \:3}}{2\cdot \:5}\\\Rightarrow x=-0.6, -1[/tex]

When x = -0.6

[tex]y=2\times -0.6+2\\\Rightarrow y=0.8[/tex]

When x = -1

[tex]y=2\times -1+2\\\Rightarrow y=0[/tex]

So, the points where the circle and line will intersect are (-0.6, 0.8) and (-1,0)

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