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 Problem: Addition subtraction 7y+2x=11,3x-y=5 [ Calculator, Method and examples ]Solution:Your problem -> Addition subtraction 7y+2x=11,3x-y=57y+2x=11:.2x+7y=11and 3x-y=5=>2x+7y=11 ->(i)=>3x-y=5 ->(ii)Adding Equation (i) and (ii), we get=>5x+6y=16=>5x+6y=16 ->(iii) (On simplifying)Subtracting Equation (ii) from (i), we get=>-x+8y=6=>x-8y=-6 ->(iv) (On simplifying)Now solving these equations (iii) and (iv) using substitution methodSuppose,5x+6y=16 ->(1)and x-8y=-6 ->(2)Taking equation (2), we havex-8y=-6=>x=8y-6 ->(3)Putting x=8y-6 in equation (1), we get5x+6y=16=>5(8y-6)+6y=16=>40y-30+6y=16=>46y-30=16=>46y=16+30=>46y=46=>y=1 ->(4)Now, Putting y=1 in equation (3), we getx=8y-6=>x=8(1)-6=>x=8-6=>x=2:. x=2" and "y=1

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