Question

1) Descubra o n real x, cuja imagem pela função y = 2-5x e:

a) 10=

b) -3=​

Answer 1

A)

$\displaystyle y = 2-5x\\10 = 2-5x\\-5x=10-2\\-5x=8\\\\x=-\frac{8}{5}$

B)

$\displaystyle y = 2-5x\\-3 = 2-5x\\-5x=-3-2\\-5x=-5\\\\x=\frac{-5}{-5}\\\\x=1$