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x = 5
f(x) = 7x - 33
f(5) = 7(5) - 33 = 35 - 33 = 2
Punto ( 5,-2 ) NO pertenece a la recta!
b)
x = 2
f(x) = 7x - 33
f(2) = 7(2) - 33 = 14 - 33 = -19
Punto ( 2,-5 ) NO pertenece a la recta!
c)
x = 4
f(x) = 7x - 33
f(4) = 7(4) - 33 = 28 - 33 = -5
Punto ( 4,-5 ) SI pertenece a la recta!
d)
x = -4
f(x) = 7x - 33
f(-4) = 7(-4) - 33 = -28 - 33 = -61
Punto ( -4,-5 ) NO pertenece a la recta!
Espero haberte ayudado, saludos!