The function f is defined by f(x)=(-8)(6)^x-4. What is the y-intercept of the graph of y=f(x) in...

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Official May 2022 US SAT Section 3 Question 14:

The function f is defined by f(x)=(-8)(6)^x-4. What is the y-intercept of the graph of y=f(x) in the xy-plane?
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Thank you so much! I was confused about how to begin this problem, but your explanation really helped!!

hannahhoatson
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do we always plug in x=0 when solving for the y intercept?

vinushajayaratna