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A polynomial equation of the first degree, such as x + y = 7

The graph of such an equation is a straight line if there are two variables.
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Evaluation of linear equation.
2,7 is a ordered pair and the answer always ordered pair.
this equation have unkwn and the given, the given is f(x)=3x+1 then multiply the f(2)=3(2)+1= 6 and you have remain +1 then add.
at last take the given no. which is f(2) or 2 and paired to the no. you add which is 7=2,7 the final answered
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