27

 PAGE: 367 SET: Exercises PROBLEM: 27

The system of equations are .

Observe the coefficient of each term are different, so the best method is Elimination using multiplication to solve the system of equations.

Elimination using multiplication:

----------(1)

----------(2)

To get two equations that contain opposite terms multiply the first equation by 4.

Add the equations to eliminate the y - variable and solve the equation.

The resultant equation is .

Divide each side by 37.

The value of  substitute in either equation to find y.

First equation: .

Subtract 15 from each side.

Divide each side by 3.

The value of .

The value of .

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