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2x+3y=-8

3y^(2)-8y=2x+10
If 
(x_(1),y_(1)) and 
(x_(2),y_(2)) are distinct solutions to the system of equations shown, what is the product of the 
x_(1) and 
x_(2) ?

2x+3y=8 2 x+3 y=-8 \newline3y28y=2x+10 3 y^{2}-8 y=2 x+10 \newlineIf (x1,y1) \left(x_{1}, y_{1}\right) and (x2,y2) \left(x_{2}, y_{2}\right) are distinct solutions to the system of equations shown, what is the product of the x1 x_{1} and x2 x_{2} ?

Full solution

Q. 2x+3y=8 2 x+3 y=-8 \newline3y28y=2x+10 3 y^{2}-8 y=2 x+10 \newlineIf (x1,y1) \left(x_{1}, y_{1}\right) and (x2,y2) \left(x_{2}, y_{2}\right) are distinct solutions to the system of equations shown, what is the product of the x1 x_{1} and x2 x_{2} ?
  1. Express xx in terms of yy: Given the system of equations:\newline11) 2x+3y=82x + 3y = -8\newline22) 3y28y=2x+103y^2 - 8y = 2x + 10\newlineWe need to find the product of the xx-coordinates of the distinct solutions to these equations.\newlineFirst, let's express xx from the first equation in terms of yy.\newline2x=83y2x = -8 - 3y\newlinex=83y2x = \frac{-8 - 3y}{2}
  2. Substitute xx into second equation: Now, substitute the expression for xx from the first equation into the second equation.\newline3y28y=2((83y)/2)+103y^2 - 8y = 2((-8 - 3y) / 2) + 10\newlineSimplify the equation.\newline3y28y=83y+103y^2 - 8y = -8 - 3y + 10\newline3y28y=23y3y^2 - 8y = 2 - 3y
  3. Set equation to zero: Next, move all terms to one side to set the equation to zero. \newline3y28y+3y2=03y^2 - 8y + 3y - 2 = 0\newlineCombine like terms.\newline3y25y2=03y^2 - 5y - 2 = 0
  4. Solve quadratic equation for y: Now, we need to solve the quadratic equation for yy. To find the roots of the quadratic equation, we can use the quadratic formula, y=b±b24ac2ay = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}, where a=3a = 3, b=5b = -5, and c=2c = -2. Let's calculate the discriminant b24acb^2 - 4ac first. Discriminant = (5)24(3)(2)(-5)^2 - 4(3)(-2) Discriminant = 25+2425 + 24 Discriminant = 4949
  5. Calculate discriminant: Since the discriminant is positive, we have two distinct real solutions for yy.\newlineNow, let's find the two solutions for yy using the quadratic formula.\newliney1,2=5±492×3y_{1,2} = \frac{5 \pm \sqrt{49}}{2 \times 3}\newliney1,2=5±76y_{1,2} = \frac{5 \pm 7}{6}\newlineWe have two solutions for yy:\newliney1=5+76y_{1} = \frac{5 + 7}{6}\newliney1=126y_{1} = \frac{12}{6}\newliney1=2y_{1} = 2\newliney2=576y_{2} = \frac{5 - 7}{6}\newliney2=26y_{2} = \frac{-2}{6}\newlineyy00
  6. Find solutions for yy: Now that we have the values for y1y_1 and y2y_2, we can find the corresponding xx-values using the expression for xx we found earlier.\newlineFor y1=2y_1 = 2:\newlinex1=(83(2))/2x_1 = (-8 - 3(2)) / 2\newlinex1=(86)/2x_1 = (-8 - 6) / 2\newlinex1=14/2x_1 = -14 / 2\newlinex1=7x_1 = -7
  7. Find x values: For y2=13y_{2} = -\frac{1}{3}:\newlinex2=(83(13))/2x_{2} = ( -8 - 3(-\frac{1}{3})) / 2\newlinex2=(8+1)/2x_{2} = (-8 + 1) / 2\newlinex2=72x_{2} = -\frac{7}{2}
  8. Calculate product of x values: Finally, we find the product of x1x_{1} and x2x_{2}.\newlineProduct = x1×x2x_{1} \times x_{2}\newlineProduct = (7)×(7/2)(-7) \times (-7 / 2)\newlineProduct = 492\frac{49}{2}