It is: x followed by y
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well, if 5-y=x, then y=x+5. basically that is only used for graphing.
If you are graphing speed over a period of time, speed goes on the y-axis and time goes on the x-axis.
You cannot solve x plus y since that is an expression, not an equation (nor inequality).
By graphing the lines on the coordinated plane they will intersect at (2, -4) which is the solution of the equations
table of values,x and y-intercept and slope and y-intercept