ANSWERS: 2

Yes, yes they do.

The slope intercept form of a linear equation is: y = mx + b Where "m" is the slope and "m" can be positive, negative, zero, or undefined. Where "b" is Yintercept and "b" can be positive, negative, zero, or nonexistant. The Yintercept does not exist, when the slope is undefined, because the line becomes a vertical line parallel to the Y axis. For example, x = 2 is a line with undefined slope and has no yintercept. I will do an example that is similar to your line: 5x + 5y = 15 Subtract 5x from both sides of the equation: 5x + 5y  5x = 15  5x simplify the left hand side: 5y = 15  5x divide both sides by 5 5y/5 = (15  5x)/5 simplify both sides: y = 3  x swap the term on the right hand side: y = x + 3 done! For your line 4x+4y=16, both the slope is defined and the yintercept exists; just use algebra to rewrite the equation so that "y" is "all alone" on the left hand side of the equation, as I did in the example.
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