No it is not.
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1. its -4 over x
Usually none. A function can be identified as f but it is more often denoted by f(x) to show that it is a function of x.
x/35 = 3/7 => x = 3/7 *35 = 3 * (35/7) = 3*5 = 15
49 - x2 = -(x2 -49) = - (x-7)(x+7) divide by x -7 Answer: -(x+7) = -x-7
No, y=x-2 is linear.