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You use the x-coordinate before the y- coordinate.
in mathematics x and y could mean different things. x and y are just simply terms that represents and unknown number. when you use x and y in different occasions they represent different things. algebra is when you use x and y.
You use it for linear equations. y=mx+b where x and y are the variables. m is the slope of the line and b is the point where the line crosses the y-axis. b is also known as the y intercept
If you mean y/2 + y (without parentheses), y/2 is the same as (1/2)y, and y is the same as 1y. You can use the distributive property to combine this; in this case, the result is (3/2)y.
To multiply two binomials you use FOIL (first, outer, inner, last): (y-9)(y+10)=y*y+10y-9y-9*10=y2+y-90