Answer:
x=12; y=138.
Step-by-step explanation:
1. 4x+(3x+6)=90 - to calculate 'x';
3x+6+y=180 - then to calculate 'y';
2. 7x+6=90; ⇒ x=12;
3. 3*12+6+y=180; ⇒ y=138°.
