Đáp án:
`x=12;y=-21`
Trình bày lời giải:
Áp dụng tích chất của dãy tỉ số bằng nhau ta có:`x/4=y/(-7)=(x-y)/(4-(-7))=33/(4+7)=33/11=3`Do đó:`{(x/4=3=>x=4.3=>x=12),(y/(-7)=3=>x=-7.3=>y=-21):}`Vậy `x=12;y=-21`
Giải thích các bước giải:
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