Question 144896
How do you know when an equation has infinitely many solutions? How do you know when an equation has no solution?
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There are a number of ways to answer your question.  Here is one of them:
Two equations have infinitely many solutions if they have the same slope
and the same y-intercept.
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To equations have no solutions if they have the same slope and different
y-intercepts.
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Cheers,
Stan H.