Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

The parabola shown is defined by the equation 
y=(1)/(3)x^(2)-2x-4. If the line defined by the equation 
y=-(8)/(3)(x+5)+9 is also graphed, at what point 
(x,y) will the line and parabola intersect?"
Choose 1 answer:
(A) 
(0,-4)
(B) 
(4,-(20)/(3))
(c) 
(3,-7)
(D) 
(-1,-(5)/(3))
quations | Lesson
quations - Basic example
quations - Harder example

The parabola shown is defined by the equation y=13x22x4 y=\frac{1}{3} x^{2}-2 x-4 . If the line defined by the equation y=83(x+5)+9 y=-\frac{8}{3}(x+5)+9 is also graphed, at what point (x,y) (x, y) will the line and parabola intersect?

Full solution

Q. The parabola shown is defined by the equation y=13x22x4 y=\frac{1}{3} x^{2}-2 x-4 . If the line defined by the equation y=83(x+5)+9 y=-\frac{8}{3}(x+5)+9 is also graphed, at what point (x,y) (x, y) will the line and parabola intersect?
  1. Set Equations Equal: To find the intersection point(s) of the line and the parabola, we need to set their equations equal to each other and solve for xx.
    y=13x22x4y = \frac{1}{3}x^2 - 2x - 4 (Parabola)
    y=83(x+5)+9y = -\frac{8}{3}(x + 5) + 9 (Line)
    13x22x4=83(x+5)+9\frac{1}{3}x^2 - 2x - 4 = -\frac{8}{3}(x + 5) + 9
  2. Simplify and Solve: Now we will simplify and solve the equation for xx.
    13x22x4=83x835+9\frac{1}{3}x^2 - 2x - 4 = -\frac{8}{3}x - \frac{8}{3}\cdot5 + 9
    13x22x4=83x403+9\frac{1}{3}x^2 - 2x - 4 = -\frac{8}{3}x - \frac{40}{3} + 9
    To clear the fractions, multiply every term by 33:
    x26x12=8x40+27x^2 - 6x - 12 = -8x - 40 + 27
  3. Combine Like Terms: Combine like terms and move all terms to one side to form a quadratic equation:\newlinex26x12+8x+13=0x^2 - 6x - 12 + 8x + 13 = 0\newlinex2+2x+1=0x^2 + 2x + 1 = 0
  4. Factor Quadratic Equation: The quadratic equation x2+2x+1x^2 + 2x + 1 can be factored as (x+1)2=0(x + 1)^2 = 0.
  5. Solve for x: Solve for x by taking the square root of both sides:\newlinex+1=0x + 1 = 0\newlinex=1x = -1
  6. Substitute xx and Solve for yy: Now that we have the xx-coordinate of the intersection point, we need to substitute xx back into either the original line or parabola equation to find the corresponding yy-coordinate.\newlineLet's substitute xx into the line's equation:\newliney=(83)(1+5)+9y = -\left(\frac{8}{3}\right)(-1 + 5) + 9
  7. Calculate y-coordinate: Calculate the y-coordinate:\newliney=83(4)+9y = -\frac{8}{3}(4) + 9\newliney=323+9y = -\frac{32}{3} + 9\newliney=323+273y = -\frac{32}{3} + \frac{27}{3}\newliney=53y = -\frac{5}{3}
  8. Find Intersection Point: The intersection point (x,y)(x,y) is (1,53)(-1, -\frac{5}{3}), which corresponds to answer choice (D)(D).

More problems from Domain and range