Hi,
I would let F be the measure of the first angle, S be the measure of the second angle and T be the measure of the third angle. Now look at the two statements you have.
the measure of the 2nd angle in a triangle is 4 more than the measure of the 1st angle,
that is
S is 4 more than F,
which is
S = F + 4.
Now the second statement
the measure of the 3rd angle is eight more than twice the measure of the 1st angle
that is
T is eight more than twice F
which is
T = 2F + 8.
Now if you just knew an equation that relates all three, F, S and T, then you could substitute F + 4 for S, 2F + 8 for T and you would have one equation in the variable F that you can solve. What fact do you know about the three angles in a triangle?
Penny
