Question

01) Determine x e y, sendo a, b e c retas paralelas.
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Answer 1

Explicação passo-a-passo:

${x\over9}={8\over12}\\ \\ 12x=72\\ x=72\div12\\ \\\fbox{ x=6 }\\ ============\\ {x-5\over x+1}={6\over24}\\ \\  24(x-5)=6(x+1)\\ 24x-120=6x+6\\ 24x-6x=6+120\\ 18x=126\\ x=126\div18\\ \\ \fbox{ x=7 }\\ ===================\\ {8\over x+1}={12\over2x-6}\\ \\ 8(2x-6)=12(x+1)\\ 16x-48=12x+12\\ 16x-12x=12+48\\ 4x=60\\ x=60\div4\\ \\\fbox{ x=15 }$