Answer:
f(x+1) = -2x-7
Step-by-step explanation:
f(x+1) = -2(x+1) -5 = -2x-7
y = 3x+9
We can use the slope intercept form
y = mx+b
where m is the slope and b is the y intercept
y = 3x +b
Substitute the point into the equation
6 = 3(-1) +b
6 = -3+b
Add 3 to each side
6+3 = -3+3+b
9 = b
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