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Sagot :
Answer:
D.f(x) = −4x + 105
D.f(x) = −4x + 105
Step-by-step explanation:
Since the function in linear, we know it has a slope.
We know 2 points
(5,85) and (10,65) are 2 points on the line
m = (y2-y1)/(x2-x1)
= (65-85)/(10-5)
=-20/5
=-4
We know a point and the slope, we can use point slope form to write the equation
y-y1 =m(x-x1)
y-85 = -4(x-5)
Distribute
y-85 = -4x+20
Add 85 to each side
y-85+85 = -4x+20+85
y = -4x+105
Changing this to function form
f(x) =-4x+105
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