Find an equation of the line through (3,8) and parallel to y=4x-8. write the equation using function notation.
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Parallel lines have the same slope so we can write the equation of the required line as y=4x+b where b is the y intercept. Plug in (3,8): 8=4×3+b, 8=12+b, b=-4, so y=4x-4, that is, f(x)=4x-4 or f:x➝4x-4.

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