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Setler [38]
2 years ago
9

Find the equation of line through (-15,9) with slope 4/5 in slope-intercept form.

Mathematics
1 answer:
krek1111 [17]2 years ago
4 0

Answer:

well, we know it is

y = -4 x + b

so all we need is b

5 = -4(9) + b

5 = -36 + b

b = 41

so

y = -4 x + 41

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If f(x) = log2(x+4), what is f-1(3)
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Imma just solve for f⁻¹(x) for this one

to solve fr the invers
replace f(x) with y
switch x and y
solve for y
replace y with f⁻¹(x)

I'm assuming your thing is f(x)=log_2(x+4)

remember

log_a(b)=c translates to a^c=b

so
if we replace y with f(x)
y=log_2(x+4)
switch
x=log_2(y+4)
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minus 4
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f^{-1}(x)=2^x-4
evaluate
f^{-1}(3)=2^3-4
f^{-1}(3)=8-4
[f^{-1}(3)=4

it equals 4
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