Find value of x

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By step

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8

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It means if x is -1 what is y then . check -1 on x axis and then check the value of y when x is -1