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2x+3y=5 ;5y+7x=1,X?,y=? |
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Answer» (2x+3y=5)5;(5x+7y=1)2By subtracting both we get10x-10x+15y-14y =25-2y=23Putting the velue of y in equation 12x+3y=52x+3×23=52x=5-692x=-64x=-32 y= 1-7x/5 putting the value of y in equation 2x+3y= 52x+3(1-7x/5)= 52x+(3-21x/5)= 5(10x+3-21x/5)=5(-11x+3/5)=5-11x+3=25-11x=25-3-11x=22x=-22/11x=-22x+3y=52(-2)+3y=5-4+3y=53y=5+43y=9y=3 |
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