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) ?
- 15
- 19
- 21
- 22
Hint:
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
The correct answer is: 19
The points lying on the graph y = h (x) are given by the table as
We need only two points to find the equation of the line
Equation of line passing through ( a, b ) and ( c, d ) is
Putting the points ( a , b ) and ( c , d ) in the above equation, we have
Simplifying, we get
Cross multiplying, we have
Expanding the product,
Finally, we get
Dividing throughout by 3, we have
Putting and rewriting the equation, we have
Thus, the values of h (8) is given by
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 lies on
So, the equation is the graph of .
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