Mathematics
SMP

求過程+解🙏

(7了) 4lx二3>二和=一9(x+7y+19)

Answers

什麼時候等號會成立? 當 0 = 0 時等號會成立

x + 3y = -7
x + 7y = -19

=> x = 2, y = -3 #

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