tolong kerjakan 19, 21, 22, 24. makasih :))

(2/3x + 1/5y=8)15 ==> 10x+3y=120
(1/3x + 1/5y= -5)15. ==> 5x-3y= -75
------------------- +
15x= 45
p | x= 3

5x-3y= -75
5(3) -3y =-75
15-3y= -75
-3y= -75 - 15
-3y= -90
q |y= 30


2p+q
2(3)+30
6+30
36