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Algebra - solving linear equations w/ substitution

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The question in the book reads:
"Suppose you try to solve a system of linear equations using substitution and get this result. How many solutions does each system have?"
1)x=-2
2)y=12
3)6=x
4)-8=-8
5)7=y
6)5=3
I understand #3 and #6, but I do not understand how to know how many solutions there are to #1,2,3,or 5.

  • Algebra - solving linear equations w/ substitution - ,

    i don't know

  • Algebra - solving linear equations w/ substitution - ,

    1)one solution
    2)one solution
    4)infinite solutions
    5)one solution

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