Hi Abby. By using substitution, we can “plug” the second equation into the first to solve for x.
The first equation will now read 4x + 2(-2x + 3.5) = 7
This gives you 4x -4x + 7 = 7
Now you have 0 + 7= 7, or 7 = 7.
There are infinitely many solutions.
Not only that, both equations have the point (0, 3.5) and (1, 1.5).
If you plot these points in each equation, you will see that.
Therefore, though the equations look different, every point for x and y will match. Both lines are exact.
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