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If 
(x,y) is a solution to the system of equations shown, what is the product of the 
y-coordinates of the solutions?

x^(2)+4y^(2)=40

x+2y=8

If (x,y) (x, y) is a solution to the system of equations shown, what is the product of the y y -coordinates of the solutions?\newlinex2+4y2=40 x^{2}+4 y^{2}=40 \newlinex+2y=8 x+2 y=8

Full solution

Q. If (x,y) (x, y) is a solution to the system of equations shown, what is the product of the y y -coordinates of the solutions?\newlinex2+4y2=40 x^{2}+4 y^{2}=40 \newlinex+2y=8 x+2 y=8
  1. Solve linear equation for x: Solve the linear equation for xx. The linear equation is x+2y=8x + 2y = 8. We can solve for xx by isolating it on one side of the equation. x=82yx = 8 - 2y
  2. Substitute expression for xx into quadratic equation: Substitute the expression for xx into the quadratic equation.\newlineThe quadratic equation is x2+4y2=40x^2 + 4y^2 = 40. We substitute x=82yx = 8 - 2y into this equation to get:\newline(82y)2+4y2=40(8 - 2y)^2 + 4y^2 = 40
  3. Expand and simplify the equation: Expand the squared term and simplify the equation.\newlineExpanding (82y)2(8 - 2y)^2 gives us 6432y+4y264 - 32y + 4y^2. Now we have:\newline6432y+4y2+4y2=4064 - 32y + 4y^2 + 4y^2 = 40\newlineCombine like terms to get:\newline6432y+8y2=4064 - 32y + 8y^2 = 40
  4. Move all terms to one side: Move all terms to one side to set the equation to zero.\newlineSubtract 4040 from both sides to get:\newline8y232y+24=08y^2 - 32y + 24 = 0
  5. Simplify the equation by dividing all terms: Simplify the equation by dividing all terms by 88.\newlineDividing each term by 88 gives us:\newliney24y+3=0y^2 - 4y + 3 = 0
  6. Factor the quadratic equation: Factor the quadratic equation.\newlineThe equation y24y+3y^2 - 4y + 3 factors into:\newline(y3)(y1)=0(y - 3)(y - 1) = 0
  7. Solve for yy: Solve for yy by setting each factor equal to zero.\newlineSetting each factor equal to zero gives us two possible yy-values:\newliney3=0y - 3 = 0 or y1=0y - 1 = 0\newlineSo, y=3y = 3 or y=1y = 1
  8. Find the product of the y-coordinates: Find the product of the y-coordinates.\newlineThe product of the y-coordinates of the solutions is:\newline3×1=33 \times 1 = 3

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