If z= 2(x+15), find y
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we know,
angle Z = angle Y Corresponding angle
Y = 2(x+15)
but angle Y + X = 180° interior angles
2(x+15) + x = 180°
2x+30+x = 180°
3x = 180-30
3x = 150
x = 50°
now,
y = z = 2(x+15)
= 2( 50+15)
= 2(65)
y = z = 130°
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