Here's the question you clicked on:
hali12
Let f(x) = -4x +8. Write the rule for a new function as a vertical translation of f(x) three units down. Do not graph. If you just give me the anwser I'll give u a medel
The translation of a vertical function is f(x) - c, where c is the unit of translation. In this case, the function would become f(x) = -4x+8 - 3.
But the -4 is the slope of the line and the 8 is the point where the line crosses the y-axis. Therefore, you only have to subtract 3 from the equation to obtain the new equation. and so the line is lowered by 3 units
@Frank1991 That is exactly what f(x) - c means...
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So b is the point where the equation crosses the y-axis. And if you change it by +1 the line just skips vertical up with 1.
In your case it has to skip down with 3 units, so just subtract 3 units from your b (which is 8) you can check it with google (just type the equation is the search bar)
http://www.wolframalpha.com/input/?i=plot+-4x%2B5%2C+-4x+%2B8%2C+for+y+in+0..10
you cant graph it.... is it 8?