The Pair of equations 5x - 15y = 8 and 3x +9y = 24/5 has:
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5x-15y=8...(i)
3x+9y=24/5...(ii)
In (i)5x=8+15y
x=(8/5)+5y
Substituting x=(8/5)+5y in (ii)
3x+9y=24/5
3[(8/5)+5y)+9y=24/5
(24/5)+15y+9y=24/5
(24/5)+24y=24/5
24y=(24/5)-(24/5)
24y=0
y=0
Substituting y=0 in (i)
5x-15y=8
5x-0=8
5x=8+0
5x=8
x=8/5
y=0
x=8/5
I hope this helps
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