distance (d) = rate (r) x time (t)
Nell: d = 12(2.5) = 30 miles
Kristen: d = 14(2.5) = 35 miles
Kristen - Nell = distance apart
35 - 30
5
Answer: 5 miles apart
The linear equation:
y = k x + b
We will use first two values and solve the system of equations:
11 = k * 7 + b / *(-1)
13 = k * 8 + b
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-11 = - k * 7 - b
13 = k * 8 + b
----------------------
2 = k
13 = 16 + b
b = 13 - 16 = -3
y = 2 x - 3 ( y varies directly with x )
I believe it's b. Hope this helps
