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y = -3x + 5
3x + y = 5 ..(1)
x + y = 3 ..(2)
-------------- -
2x = 2
x = 2/2
x = 1
x + y = 3
1 + y = 3
y = 3 - 1
y = 2
3.)
y = 3x + 6
-3x + y = 6 ..(1)
y = -2x + 11
2x + y = 11
-3x + y = 6
2x + y = 11
--------------- -
-5x = -5
x = -5/-5
x = 1
2x + y = 11
2.1 + y = 11
2 + y = 11
y = 11 - 2
y = 9
4.)
x = y
x - y = 0 ..(1)
x + y = 15 ..(2)
--------------- -
-2y = -15
y = -15/-2
y = 7,5
x = y
x = 7,5
5.)
1/2x + y - 8 = 0
1/2x + y = 8 ..(1)
2x - y - 2 = 0
2x - y = 2 ..(2)
1/2x + y = 8
2x - y = 2
------------------ +
5/2x = 10
x = 10 . 2/5
x = 4
2x - y = 2
2.4 - y = 2
8 - y = 2
-y = 2 - 8
-y = -6
y = 6
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