will mark as brainliest
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Step-by-step explanation:
1.
a) 5x+x = 90°
=> 6x = 90°
=> x = 15°
b)
5y + 3° + 4y+ 8° + (180-146)° = 180° (Sum of all angles)
=>9y + 11° = 146°
=> 9y = 135°
=> y = 15°