Answer:
Step-by-step explanation:
4x + 23 + 9x - 38 = 180
13x - 15 = 180
13x = 195
x = 15
4(15) + 23= 60 + 23= 83
9(15) - 38 = 135 - 38= 97
21y - 1 + 97 = 180
21y + 96 = 180
21y = 84
y = 4
21(4) - 1 = 84 - 1 = 83
4x+23+9x-38=180linear pair
13 x=180+15
x=195/13=15
again
4x+23=21y-1alternate angle
5×15+23=21y-1
83+1=21y
y=84/21=4 therefore value of y is 4
