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Answer» `-2` `-1/2` `2` 6 Solution :Graphically, a system of linear equations that has no solution INDICATES two parallel lines-that is, two lines that have the same slope but different y-intercepts. To have the same slope, the x-and y-coefficient must be the same. To get from `-2/3` to `-8,` you multiply by 12, so multiply `-1/2x ` by 12 as well to yield 6x. Because the other x-coeffieient is a, it must be that `a =6,` and (D) is correct. Note that, even though it is more work, you could ALSO write each EQUATION in slope-intercept FORM and SET the slopes equal to each other to solve for a.
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