Respuesta :

its pretty simple really, you have to find b to begin

p.s. you don't need to worry about 8c+5d, that's just there to confuse you.


these to angles : (12b+6)° and (2b+6)° if added together have to equal 180°

so you add the two equations together


(12b+6)+(2b+6)=180

you then solve for b:


add like terms together
12b+2b and 6+6

you then are left with

14b+12=180

then you solve for x

14b+12=180
-12 -12
14b=168
÷14 ÷14
b=12


now that you have B you
plug that in to the original equation opposite of (4a)

(2b+6)

you plug in the number you got for b

2(12)+6
24+6
=30

so now you now the angle opposite of (4a)
and opposite angles have to equal each other so
4a=30

solve for a and that's your answer

4a=30
÷4. ÷4
a=7.5










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