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Verified answer
Bab Persamaan LinearMatematika SMP Kelas VIII
12x + 3y = 9
4x + y = 3
y = -4x + 3
5x + 7y = -2
5x + 7 (-4x + 3) = -2
5x - 28x + 21 = -2
-23x = -2 - 21
x = -23/-23
x = 1
y = -4x + 3
= -4 . (1) + 3
= -1
5x + 4y = 5 . 1 + 4 . (-1)
= 5 - 4
= 1