It means the relation between the variables, x1, x2, x3, ..., xn is of the form a1*x1 + a2*x2 + a3*x3 + ... +an*xn = b, where a1, a2, a3, ...,an and b are constants.
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sum means the answer of a math problem
Justification in math terms means to show how you solved the math problem. Lay out the problem and show step-by-step how the problem is solved.
The word increased in a math problem means you are adding to terms or numbers.
C ; solution means the answer to an addition problem in math .
Gain means to subtract in a math problem because if you were doing a math problem and it said to gain (loose) 9-8=1 so that would be your answer