Which of the following tables represent input and output values of a linear function? Select all that apply. Graph them on grid
paper, if needed.
Input Output
1 3.5
2 5.5
3 7.5
4 9.5
Input Output
3 3
5 5
6 6
8 8
Input Output
0 1
1 2
2 5
3 10
Input Output
2 8
4 9
6 10
8 11
Input Output
1 3.5
2 5.5
3 7.5
4 9.5
Input Output
3 3
5 5
6 6
8 8
Input Output
0 1
1 2
2 5
3 10
Input Output
2 8
4 9
6 10
8 11
1 answer:
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After 85 minutes of calls, there are $27.25 left on the card.
<h3>What is the remaining credit after 85 minutes of calls?</h3>
A linear equation in slope-intercept form is:
y = a*x + b
Where a is the slope.
If the line passes through two points (x₁, y₁) and (x₂, y₂) the slope is:
In this case, we know that the line passes through the points (22, 36.7) and (52, 32,20)
(points of the form (time, dollars)).
So the slope is:
The linear equation is then:
y = -0.15*x + b
To find the value of b, we use the point (22. 36.7)
36.7 = -0.15*22 + b
36.7 + 0.15*22 = b = 40
Then the linear equation is:
y = -0.15*x +40
The amount remaining in the credit card after 85 minutes is given by evaluating the above equation in x = 85.
y = -0.15*85 + 40 = 27.25
This means that after 85 minutes of calls, there are $27.25 left on the card.
If you want to learn more about linear equations:
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