exam Maths Puzzle Numerical Ability

How do i graph this linear equation and is it a function

y=x-10

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exam Other Question

20) John owns a hotdog stand. He has found that his profit is represented by the equation
P(x) = -x2 + 66x + 82, with P being profits and x the number of hotdogs sold. How many
hotdogs must he sell to earn the most profit? Please help solve this problem for me thank you.
If f(x)=2x^-7x+3 find f(2), and find f(-3) please show detail work. Thank you again.