3х+у=1
х=0; у=1
х=1/3; у=0
х=-1; у=4
2) х=(у+5)/2
3) 10*х+6*12=8
10х=8-72
10х=-64
х=-6.4
4)2а-4*3=3*1
а=(12+3)/2
а=7.5
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Verified answer
3х+у=1
х=0; у=1
х=1/3; у=0
х=-1; у=4
2) х=(у+5)/2
3) 10*х+6*12=8
10х=8-72
10х=-64
х=-6.4
4)2а-4*3=3*1
а=(12+3)/2
а=7.5