9514 1404 393
Answer:
see below
Explanation:
It is easiest to compare the equations when they are written in the same form.
The first set can be written in slope-intercept form.
y = 2x +7
y = 2x +7 . . . . add 2x
These equations are identical, so have infinitely many solutions.
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The second set can be written in standard form.
y +4x = -5
y +4x = -10
These equations differ only in their constant, so have no solutions.
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The third set is already written in slope-intercept form. The equations have different slopes, so have exactly one solution.