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hay varios metodos, yo usare el mio
primero hallar el valor de "t"
a) 5t+6r=184
5t = 184-6r
t = 184-6r / 5
ahora valor de "r"
b) 6t+7r=219
reemplazamos por el valor nuevo de "t"
6[ (184-6r) / 5 ] +7r = 219
6(184-6r) /5 +7r = 219
(1104-36r / 5) +(7r/1) = 219
(1104-36r) + (35r) / 5 = 219
1104 - r / 5 = 219
1104 - r = 219 × 5
-r = 1095 -1104
r = -9 / -1
r = 9
verdadero valor de "r"
ahora, buscar el verdadero valor de "t"
a) 5t+6r=184
5t + 6(9) = 184
5t + 54 = 184
5t = 184 - 54
t = 130 / 5
t = 26
entonces:
r = 9
t = 26