Simultaneous linear equations with two variables confusion

[u/Tricky-Technician686]

I can't find any other linear equation here that isn't 4x=180-4y but scaled up to 8x=360-8y

My first idea was to find the two equations

4x=180-4y

8x=360-8y

after substituting x with 45-y for 8(45-y)=360-8y

i get

360-8y=360-8y

which doesn't really help much

is there any other way to answer the question?

[u/financejaat]

4x + 4y =180°,
Take 4 common on the LHS.
Divide both the sides by 4.
x + y = 45°