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1.7a+b=-4.5 => a=-(b+4.5)/1.7
-11/5a+b=-11/4 => -11/5(-(b+4.5)/1.7)+b=-11/4 => (11b-49.5)/8.5+b=-11/4
19.5/8.5b=-11/4+(49.5/8.5) => b=(11*8.5+49.5)/19.5=(93.5+49.5)/19.5 => b=143/19.5
a=-(143/19.5+4.5)/7=143/(19.5*7)+4.5/7 => a=143/136.5+4.5/7

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