Respuesta :

danielmaduroh
f(x) is the function, that is, when x take some value, f(x) is the image for this value, so you name y = f(x), then:

if x = a

y = f(a) 
y = 4a - 3


If y = b

y = f(b)
y = 4b - 3

So in this case y = f(x) represents a straight line
f(x) is another way of saying y.

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