5 and 7 are two coefficient. And that is all. There is no third coefficient.
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There is no single coefficient for that equation, as a coefficient is the number by which any term is multiplied. The coefficients in that equation are 5, 2, 4 and 3.
When c = -3 then 4c + 5c - 2 = [4 x -3] + [5 x -3] - 2 = -12 +(-15) - 2 = -12 -15 -2 = -29
it is 3. You are doing APEX right?
'-3' is the co-efficient of 'y'. The number attached to the variable is the co-efficient. A coefficient of a variable is the numeral right next to the variable in question. So in the expression 8-3y+1 the 3 (or is it -3? I'm not sure) is the coefficient of y.
The coefficient of '3n' is 3; n is the VARIABLE; n is often chosen for 'number'.