9d + 2 = 56 The solution is d =
2 answers:
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The answers are 2 and 3
A system of linear equations 
has:
1. unique solution, when:
;
2. no solutions, when:
;
3. infinitely many solutions, when:
.
According to the part 3 you can create such system:
Graphs (the same line) are shown on the added picture.
1. unique solution, when:
2. no solutions, when:
3. infinitely many solutions, when:
According to the part 3 you can create such system:
Graphs (the same line) are shown on the added picture.