3x = 4x - 15
3x - 4x = -15
- x = -15
x = 15
3x = 3×15 = 45°
3x + y = 180°
45° + y = 180°
y = 180° - 45°
y = 135°
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3x = 4x - 15
3x - 4x = -15
- x = -15
x = 15
3x = 3×15 = 45°
3x + y = 180°
45° + y = 180°
y = 180° - 45°
y = 135°