exam Maths Puzzle Numerical Ability

1) In what fundamental way does the solution set of a system of linear equations differ from the solution set of a system of linear inequalities? Please give examples and the impor

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Please i need help with this problem:

The cost of 63 inches of ribbon at 12 cents per yard is? please help?

Write each system as a matrix equation. Identify the coefficient matrix, the variable, matrix, and the constant matrix.

{r-s + t = 150
2r + t = 425
s + 3