Maths-
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Question


For a certain group of fish, the graph models the relationship between body length L, in centimeters (cm), and tail area A, in square centimeters open parentheses c m to the power of 2 end exponent close parentheses, where 6 less or equal than L less or equal than 34. Which equation represents the relationship between body length and tail area?

  1. A equals 0.02 L to the power of 2 end exponent    
  2. A equals 1.23 L to the power of 2 end exponent    
  3. A equals 2.02 L to the power of 2 end exponent    
  4. A equals 3.23 L to the power of 2 end exponent    

The correct answer is: A equals 0.02 L to the power of 2 end exponent


    Observe that the graph is non-linear and from the given options it is clear that it is of the form y equals m x to the power of 2 end exponent, where m is the slope the line.
    Explanations:
    Step 1 of 2:
    Observe that in the graph, the line goes through a point (15, 5).
    We put the value of the coordinates of x = 15 and y = 5, to get the slope of the line, in order to find the equation of the non-linear curve.
    Step 2 of 2:
    We have y equals m x to the power of 2 end exponent, where y = tail area A and x = body length L.
    Putting x = 15 and y = 5, we get
    5 equals m 15 to the power of 2 end exponent
    rightwards double arrow m equals fraction numerator 5 over denominator 15 to the power of 2 end exponent end fraction equals fraction numerator 1 over denominator 45 end fraction approximately equal to 0.02
    So, the equation be A equals 0.02 L to the power of 2 end exponent.
    Final Answer:
    The right option is— A equals 0.02 L to the power of 2 end exponent.

    Solving quadratic equations using a graph is an effective method for locating estimated solutions or roots for quadratic equations or functions.
    The real roots of a quadratic function might be zero, one (repeated), or two. Finding the origins involves solving a quadratic equation with the right-hand side equal to zero, such as ax² + bx + c = 0.
    Points to consider to solve a quadratic equation using a graph :
    • Rearrange the equation so that one side corresponds to the graphed function.
    • Plot the function y= the other side of the equation.
    • To find the solutions, draw vertical lines down to the x-axis from the intersection points.

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