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x + y = 6
disustitusi
y + y = 6
2y = 6
y = 3
x = y
x = 3
^_^
cherry
x = y => x - y = 0
x + y = 6
"gunakan metode eliminasi"
eliminasi y
x - y = 0
x + y= 6
------------- +
2x = 6
x = 6/2
x = 3
nilai x = 3
substitusi x = 3 ke persamaan x+y = 6
x + y = 6
3 + y = 6
y = 6-3
y = 3
nilai y = 3
himpunan penyelesaiannya {3,3}