Maths-
General
Easy

Question


The table above shows selected values for the function h . In the x y -plane, the graph of y = h(x) h  is a line. What is the value of (8)  ?

  1. 15
  2. 19
  3. 21
  4. 22

hintHint:

Hint:
To find the value of h (8) , we first find the value of the function h (x) .
It is given that the graph of the equation is a line. And we are given points lying on the line, so we need to find the equation of  h (x) using these points. For two points ( a , b )  and (c , d ) , the equation of line passing through them is given by
fraction numerator y minus d over denominator d minus b end fraction equals fraction numerator x minus c over denominator c minus a end fraction

The correct answer is: 19


    The points lying on the graph y = h (x)  are given by the table as
    left parenthesis negative 1 comma 1 right parenthesis comma left parenthesis 2 comma 7 right parenthesis comma left parenthesis 4 comma 11 right parenthesis
    We need only two points to find the equation of the line y equals h left parenthesis x right parenthesis
    Equation of line passing through  ( a, b )  and  ( c, d ) is
    fraction numerator y minus d over denominator d minus b end fraction equals fraction numerator x minus c over denominator c minus a end fraction
    Putting the points  ( a , b ) and  ( c , d ) in the above equation, we have
    fraction numerator y minus 7 over denominator 7 minus 1 end fraction equals fraction numerator x minus 2 over denominator 2 minus left parenthesis negative 1 right parenthesis end fraction
    Simplifying, we get
    fraction numerator y minus 7 over denominator 6 end fraction equals fraction numerator x minus 2 over denominator 3 end fraction
    Cross multiplying, we have
    3 left parenthesis y minus 7 right parenthesis equals 6 left parenthesis x minus 2 right parenthesis
    Expanding the product,
    3 y minus 21 equals 6 x minus 12
    Finally, we get
    3 y equals 6 x minus 12 plus 21 equals 6 x plus 9
    Dividing throughout by 3, we have
    y equals 2 x plus 3
    Putting y equals h left parenthesis x right parenthesis  and rewriting the equation, we have
    h left parenthesis x right parenthesis equals 2 x plus 3
    Thus, the values of h (8) is given by
    h left parenthesis 8 right parenthesis equals 2.8 plus 3 equals 16 plus 3 equals 19
    The correct option is B)

    Note:
    After finding the equation y = 2x + 3 , we can verify it by putting the third point in the equation and check if it lies on the line, that is, the third point which is  left parenthesis 4 comma 11 right parenthesis lies on y equals h left parenthesis x right parenthesis
    11 equals 2.4 plus 3
    So, the equation  h left parenthesis x right parenthesis equals 2 x plus 3 is the graph of y equals h left parenthesis x right parenthesis.

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