Question: Solve the indicated or given systems of equations by an appropriate algebraic method. Solve the following system of equations by (a) Solving the first equation

Solve the indicated or given systems of equations by an appropriate algebraic method.

Solve the following system of equations by 

(a) Solving the first equation for x and substituting, and 

(b) Solving the first equation for y and substituting.

2x + y = 4 3x - 4y = -5

2x + y = 4 3x - 4y = -5

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