19. Pada gambar di bawah ini, tentukan nilai x, y, dan z. a. 25 *- 50 X-50 2 b. y 5x-80° 2x - 10 2
a. x - 50 + (x - 50) = 180
x - 50 + x - 50 = 180
2x - 100 = 180
2x = 180 + 100
2x = 280
x = 280/2
x = 140
y = x - 50
y = 140 - 50
y = 90
z = x - 50
z = 140 - 50
z = 90
b. 5x - 80 = 2x - 10
5x - 2x = -10 + 80
3x = 70
x = 70/3
x = 23,33
y + 5x - 80 = 180
y + 5(23,33) - 80 = 180
y + 116,65 - 80 = 180
y = 180 - 116,65 + 80
y = 143,35
z + 2x - 10 = 180
z + 2(23,33) - 10 = 180
z + 46,66 - 10 = 180
z = 180 - 46,66 + 10
z = 143,34
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