2x+1.3y=48=24.31
=> x + 1 = 4 => x = 3 ; y = 1
Vậy x = 3 ; y = 1
2x+1.3y=48
=> 2x+1.3y=16.3
=> 2x+1.3y=24.31
+) 2x+1=24
=> x+1=4
=> x=3
+) 3y=31
=> y=1
Vậy x=3; y=1.
2x+1.3y=48
=>2x+1.3y=24.3
=>3y:3=24:2x+1
=>3y-1=23-x
*Xét y=1=>y-1=0=>3y-1=1=20=23-x
=>3-x=0=>x=3
*Xét y>1=>y-1>0=>3y-1 chia hết cho 3=>23-x chia hết cho 3
=>Vô lí
Vậy y=1,x=3