Use the matrix tool to solve the system of equations. choose the correct ordered pair.7x - 4y = 13 2x - 5y = -4

Solutions 

In Matrix we use initially based on systems of linear equations.The matrix method is similar to the method of Elimination as but is a lot cleaner than the elimination method.Solving systems of equations by Matrix Method involves expressing the system of equations in form of a matrix and then reducing that matrix into what is known as Row Echelon Form. 

Calculations 

⇒ Rewrite the linear equations above as a matrix 

 

⇒  Apply to Row₂ : Row₂ - 2/7 Row₁ 

 

⇒ Simplify rows 

 

Note: The matrix is now in echelon form.
The steps below are for back substitution. 

⇒ Apply to Row₁ : Row₁ + 4 Row₂ 



⇒ Simplify rows 

 

⇒ Therefore, 

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Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.