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4t=-1-5s
4t=-1-5(-3t+3/4)
4t=-1+15t-15/4
4t-15t=-1-(15/4)
-11t=-19/4
t=19/44
ahora remplazamos t en ecuacion 1
s=-3t+3/4
s=-3(19/54)+(3/4)
s=(-57/44)+(3/4)
s=-6/11
saludos