This is an equation of a straight line. A solution for two unknowns requires two (independent) equations; there is only one here.
Every point that is on that line is a solution to the equation. So you can let x be any real number and find a corresponding y. This ordered pair (x,y) will be a solution to the equation as well as a point on the graph of the line.
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4x-2y = 5 -2y = -4x+5 y = 2x-2.5 The slope is 2 and the y intercept is -2.5
No.
10-2y
4x+2y = 20 2y = -4x+20 y = -2x+10
4x + 2y = 6 (first equation x 2) 4x + 2y = 6 (second equation rearranged) No unique answer exists