If 3x + 5 y is equal to 9 and 5 x + 3 y equal to 7 what is the value of x plus y
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Step-by-step explanation:
3x+5y=9-----(1)
5x+3y=7-----(2)
multiplying eq(1) by 5 & eq(2) by 3 we get
15x+25y=45
-15x ± 9y= - 21
_____________
16y=24
y=
16
24
=
2
3
[y=
2
3
] and x=
3
9−5x
2
3
=
2
−1
Hence[x=
2
1
]& [y=
2
3
]
so x+y=
2
1
+
2
3
=2
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