General
General
Easy

Question

Determine the linear function from the data in the table.

  1. f left parenthesis x right parenthesis equals 6 x plus 180
  2. f left parenthesis x right parenthesis equals negative 6 x minus 180
  3. f left parenthesis x right parenthesis equals negative 6 x plus 180
  4. f left parenthesis x right parenthesis equals 6 x minus 180

hintHint:

We are given a table of values of x and f(x). Using the values, we have to write a linear function. A linear function is a function where the highest degree of variables is 1. The variables can be multiplied by constants. The operation between variables is addition or subtraction.

The correct answer is: f left parenthesis x right parenthesis equals negative 6 x plus 180


    We will write y = f(x)
    For this question, we will use the slope intercept form
    The slope intercept form is y = mx + c
    Here, y and x are the given values. The variable “m” represents a slope or the rate of change of the values. The variable “c” is the y-intercept.
    m space equals fraction numerator increment y over denominator increment x end fraction
    Using the values from given table, we will find the values of m and c.
    From the table we can see that y is decreasing by 6. And, x is changing by value 1.
    m space equals space fraction numerator negative 6 over denominator 1 end fraction
m space equals space minus 6
    The equation becomes y = -6x + c.
    To find the value of c, we will substitute one of the ordered pair of x and y in the given equation.
    Let’s substitute x = 0 and y = 180
    y = -6x + c
    180 = -6(0) + c
    c = 180
    We will substitute this value in the above equation.
    y = -6x + 180
    Therefore, the linear equation for the given table is f(x) = -6x + 180.

    A linear equation when plotted on graph gives a line. For such questions, we should know about the slope intercept form.

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