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-5y+ 3y = 21 ....kalikan 4 -------> -20x + 12y = 84
-------------------------- -
29x = - 87
x = - 87/29
x = - 3
3x + 4y = - 1
3.(-3) + 4y = - 1
-9 + 4y = - 1
4y = - 1 + 9
4y = 8
y = 8/4
y = 2
3x + 3y = 3(x + y)
= 3(- 3 + 2)
= 3(- 1)
= - 3