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

[x^(2)+y^(2)=9],
[x+y=3]

If (x,y)(x,y) is a solution to the system of equations shown, what is the product of the y-coordinates of the solutions?\newlinex2+y2=9x^{2}+y^{2}=9 \newlinex+y=3 x+y=3

Full solution

Q. If (x,y)(x,y) is a solution to the system of equations shown, what is the product of the y-coordinates of the solutions?\newlinex2+y2=9x^{2}+y^{2}=9 \newlinex+y=3 x+y=3
  1. Write Equations: Write down the given system of equations.\newlineWe have the following system of equations:\newline11) x2+y2=9 x^2 + y^2 = 9 \newline22) x+y=3 x + y = 3
  2. Solve for y: Solve the second equation for one of the variables.\newlineLet's solve for y y :\newliney=3x y = 3 - x
  3. Substitute and Simplify: Substitute the expression for y y from Step 22 into the first equation.\newlineSubstituting y=3x y = 3 - x into x2+y2=9 x^2 + y^2 = 9 gives us:\newlinex2+(3x)2=9 x^2 + (3 - x)^2 = 9
  4. Expand and Combine Terms: Expand the squared term and simplify the equation.\newlineExpanding (3x)2 (3 - x)^2 gives us 96x+x2 9 - 6x + x^2 , so the equation becomes:\newlinex2+96x+x2=9 x^2 + 9 - 6x + x^2 = 9 \newlineCombining like terms, we get:\newline2x26x+9=9 2x^2 - 6x + 9 = 9
  5. Subtract to Simplify: Subtract 99 from both sides to simplify the equation further.\newline2x26x+99=99 2x^2 - 6x + 9 - 9 = 9 - 9 \newlineThis simplifies to:\newline2x26x=0 2x^2 - 6x = 0
  6. Factor Out x: Factor out the common term x x .\newlinex(2x6)=0 x(2x - 6) = 0
  7. Solve for x: Solve for x x using the zero product property.\newlineSetting each factor equal to zero gives us two possible solutions for x x :\newline11) x=0 x = 0 \newline22) 2x6=0 2x - 6 = 0 which simplifies to x=3 x = 3
  8. Find y-Values: Find the corresponding y y -values for each x x -value.\newlineUsing y=3x y = 3 - x , we find the y y -values:\newlineFor x=0 x = 0 , y=30=3 y = 3 - 0 = 3 \newlineFor x=3 x = 3 , y=33=0 y = 3 - 3 = 0
  9. Calculate Product: Calculate the product of the y y -coordinates.\newlineThe y y -coordinates are 33 and 00. The product of these is:\newline3×0=0 3 \times 0 = 0

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