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find the points of intersection by solving the simultaneous equations x^2 + y^2 = 13 y=x+1

0 votes
x^2 + y^2= 13

y= x + 1
asked Nov 15, 2013 in ALGEBRA 1 by mathgirl Apprentice
reshown Nov 15, 2013 by goushi

2 Answers

0 votes

To find the intersection point of given equations,convert in to y = f(x) form.

x^2+y^2 = 13

y^2 = 13-x^2

Take square root to each side.

√y^2 =√13-x^2

y =√13-x^2 ----------> (1)

y = x+1 -----------> (2)

From (1) and (2) we also write x+1 =√(13-x^2)

Squring to each side.

(x+1)^2 =[√(13-x^2)]^2

x^2+1+2x = 13-x^2

Bring all the terms to left side.

x^2+1+2x-13+x^2 = 0

2x^2+2x-12 = 0

Divide by 2 to each side.

(2x^2+2x-12)/2 = 0/2

x^2+x-6 = 0

Factorize the above quadratic equation.

x^2+3x-2x-6 = 0

x(x+3)-2(x+3) = 0

(x-2)(x+3) = 0

x =2, x = -3

Intersection point to given simultaneous equations x^2+y^2 = 13, y = x+1 is (2, -3)

 

answered Nov 15, 2013 by william Mentor

The points of intersection by solving the simultaneous equations x2 + y2 = 13 and y = x + 1 are (- 3, - 2) and (2, 3).

0 votes

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y = x + 1

Substitute y value in given equation

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If x = -3 then y = x + 1==> y = -3 + 1 ==> y  = -2

If x = 2 then y = x + 1==> y = 2 + 1 ==> y  = 3

answered Nov 16, 2013 by jouis Apprentice

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