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5x - 2y - 8 = 0
masukkan nilai -2 ke dalam x
5(-2) - 2y - 8 = 0
-10 - 2y - 8 = 0
-2y -18 = 0
-2y = 18
2y = -18
y = -18/2
y = -9
==========
4x = y - 22
3x = 2y - 11
4x = y - 22
4x - y = -22
-y = -4x - 22
y = 4x + 22
2y = 8x + 44
3x = 2y - 11
3x = (8x + 44) - 11
3x = 8x + 33
3x - 8x = 33
-5x = 33
5x = -33
x = -33/5
4x = y - 22
4(-33/5) = y - 22
-132/5 = y - 22
kali 5
-132 = 5y - 110
-5y = 132 - 110
-5y = 22
5y = -22
y = -22/5
5a - 5b = 5(-33/5) - 5(-22/5)
= -33 + 22
= -11