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2(3x+y)= -20
-x-y=2 / *2
6x+2y= -20
-2y-2y=4
6x+2y= -20
4x= -16//4
x= -4
-x-y=2
2(3x+y)= -20
-x-y=2 / *6
6x+2y= -20
-6x-6y=12
6x+2y=-20
-4y=-8//(-4)
y=2
f) 4x+3y=54
⅓ x=4(1+ ⅛ y)
4x+3y=54
1/3x=4+1/2y
4x+3y=54
1/3x-1/2y=4/*(-12)
4x+3y=54
-4x+6y=-48
9y=6//9
y=6/9
y=2/3
f) 4x+3y=54
⅓ x=4(1+ ⅛ y)
4x+3y=54
1/3x=4+1/2y
4x+3y=54
1/3x-1/2y=4/*6
4x+3y=54
2x-3y=24
6x=78//6
x=13