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Solve the system by substitution

x + 7y= -5
-6x + 7y= -19

User Ed Ballot
by
8.3k points

1 Answer

2 votes

Answer: (x,y) = (2,-1)

Work Shown

Solve the first equation for x.

x + 7y = -5

x = -7y-5

Plug this into the other equation to solve for y.

-6x + 7y = -19

-6(-7y-5) + 7y = -19

42y+30+7y = -19

49y = -19-30

49y = -49

y = -49/49

y = -1

Use this y value to determine x.

x = -7y-5

x = -7(-1)-5

x = 7-5

x = 2

The solution is the ordered pair (x,y) = (2,-1)

This is where the two lines intersect.

User Balaweblog
by
8.0k points

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