Solve system of equations using elimination method

Algebra
Tutor: None Selected Time limit: 1 Day

8a+6b=-6

-8a+b=55

Determine the solution of the system , ordered pairs if needed.

Oct 3rd, 2015

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8a + 6b = -6 ---(1)

-8a + b = 55 ---(2)


Add equations (1) and (2) to eliminate a

8a + 6b = -6 

-8a + b = 55 

        7b = 49

          b = 49/7

          b = 7


Substitute value of b in equation (1)

8a + 6*7 = -6

8a + 42 = -6

8a = -6 - 42

8a = -48

a = -48/8

a = -6


So the solution of the system is 

a = -6, b = 7

In ordered pairs (-6, 7)

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Sep 21st, 2015

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