Question #311228

Equivalent Method; 1. 4x-6y=6 ; 7x-3y=6 2. 3x-3y=8; 9x- 4y=3


1
Expert's answer
2022-03-16T04:05:59-0400

1.4x6y=67x3y=6{4x6y=67x3y=6{4x6y=614x+6y=1210x=6x=0.670.63y=63y=1.8y=0.6(0.6,0.6)1. \\ 4x-6y=6\\ 7x-3y=6\\ \left\{\begin{matrix} 4x-6y=6\\ 7x-3y=6 \end{matrix}\right.\\\left\{\begin{matrix} 4x-6y=6\\ -14x+6y=-12 \end{matrix}\right.\\ -10x=-6\\ x=0.6\\ 7\cdot0.6-3y=6\\ 3y=-1.8\\ y=-0.6\\ (0.6,-0.6)

2.3x3y=89x4y=3{3x3y=89x4y=3{9x+9y=249x4y=35y=21y=2153x3(215)=83x=235x=2315(2315,215)2.\\3x-3y=8\\ 9x-4y=3\\ \left\{\begin{matrix} 3x-3y=8\\ 9x-4y=3 \end{matrix}\right.\\ \left\{\begin{matrix} -9x+9y=-24\\ 9x-4y=3 \end{matrix}\right.\\ 5y=-21\\ y=-\frac{21}{5}\\ 3x-3\cdot(-\frac{21}{5})=8\\ 3x=-\frac{23}{5}\\ x=-\frac{23}{15}\\ (-\frac{23}{15},-\frac{21}{5})


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