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(PLEASE HELP) A function has the function rule y = -2x+1. If the output is 9, what is the input?
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(PLEASE HELP) A function has the function rule y = -2x+1. If the output is 9, what is the input?

User Fcastillo
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So first what you want to do is input 9 as the output, which is Y. So you have the equation :
9 = -2x + 1
to solve : subtract 1 from each side so you have 8 = -2x
then : divide each side by -2
you will have the answer :

x or input, = -4
User Mpaf
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