The linear function there after 18 minutes of calls, then the credit was = $29
The slope of a line is a measure of its steepness. Mathematically, slope is calculated as "rise over run" (change in y divided by change in x).
Given that,
Slope = -0.16
There linear function is $29.00 in credit remaining on the card after 25 minutes of calls
There after 18 minutes of calls?
Slope m = -0.16
Let us assume,
x = 25 minutes
y = $29.00 in credit
Substitute this values,
So,
We can write,
y = mx + b
$29.00 = (-0.16) (25) + b
$29.00 = -24.84 + b
b = $29.00 + 24.84
b = $53.84
We can substitute b value,
y = mx + b
y = (-0.16) x + $53.84
y = [tex]-0.16x[/tex] + $53.84
y = (-0.16)(25) + $53.84
y = -24.84 + $53.84
y = $29
Therefore,
The linear function there after 18 minutes of calls, then the credit was = $29
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