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5m + 4n = 28
disubstitusikan :
5m + 4n = 28
5(14+2n) + 4n = 28
70 + 10n + 4n = 28
14n = 28 - 70
14n = -42
n = -42/14
= -3
m = 14 + 2n
= 14 + 2 (-3)
= 14 - 6
= 8
3m - 2n = 3 (8) - 2 (-3)
= 24 + 6
= 30
5m + 4n = 28
disubstitusikan :
5m + 4n = 28
5(14+2n) + 4n = 28
70 + 10n + 4n = 28
14n = 28 - 70
14n = -42
n = -42/14
= -3
m = 14 + 2n
= 14 + 2 (-3)
= 14 - 6
= 8
3m - 2n = 3 (8) - 2 (-3)
= 24 + 6
= 30