Pliss dijwb 2 soal itu yaa,mksh :)

5x + (4x + 9) = 180
5x + 4x + 9 = 180
9x + 9 = 180
________________(dibagi 9)
x + 1 = 20
x = 19

SQR = 4x + 9
= 4(19) + 9
= 76 + 9
= 85

sudut pelurus = 180°
180° = 5x + 4x + 9
180° - 9 = 9x
171° = 9x
x = 19

SQR = 4(19) +9 = 76 + 9 = 85°

4/3 = 12/y+5

4(y+5) = 3x12
4y + 20 = 36
4y = 36 -20
4y = 16
y = 4