The expression "13 plus y" represents the sum of 13 and a variable y. It is written in algebraic notation to denote a mathematical operation. The result of this expression will depend on the specific value assigned to the variable y.
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Well, honey, 13 plus y is just 13 + y. I mean, it's not rocket science. Just add 13 to whatever the heck y is and there you have it. Math made easy, darling.
9y+3 = 5y+13 9y-5y = 13-3 4y = 10 y =2.5
2x + y = 5 so y = 5 - 2x; This gives x - 3(5 - 2x) = 13 ie x + 6x = 13 + 15 so x = 4 and y must be -3
If you mean y+2 = -3(x -5) then y = -3x+13 whereas -3 is the slope and 13 is the y intercept
If you mean: y=6+x/ x=7 Then that is the equation for a line. Put in any number for "x" and "y" will always be 6 more than that. In this case, y=13
xy + x + y + 1 = (x + 1)(y + 1).