Question 127127
{{{f(x) = 3x + 1}}} Start with the given function



{{{f(a+3) = 3(a + 3) + 1}}} Plug in {{{x=a + 3}}}



{{{f(a+3) = 3a + 9 + 1}}} Distribute



{{{f(a+3) = 3a + 10}}} Combine like terms