Then the linear equation for the second railroad track is:
y = 3*x + 3
We know that the equation will be parallel to the line:
y = 3x + 9
Remember that two lines are parallel if the lines have the same slope, then the other linear equation is something like:
y = 3x + b
To find the value of b we use the fact that the line passes through (2, 9), this means that:
9 = 3*2 + b
9 - 6 = b
3 = b
Then the linear equation for the second railroad track is:
y = 3*x + 3
If you want to learn more about linear equations:
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