Solve the system by elimination x-3.1y=11.5 -x+3.5y=-13.5

solving the given equation,

x-3.1y=11.5

-x+3.5y=-13.5

0.4y= -2.5

or, y= -2.5÷0.4

or, y= -6.25

put the value of y in first eqn

x-3.1×(-6.25)=11.5

or, x+ 19.375=11.5

or, x= 11.5-19.375

or, x = -7.875

therefore x = -7.875 and y= -6.25ans.

addition

step-by-step explanation:

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step-by-step explanation: