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#1 2014-07-21 06:17:22

floowenef
Guest

Solving Systems of Equations Using Substitution Method and Elimination

I need help with the following:

Solve the systems of equations in numbers 1 – 9 using substitution. Show your work.

1.   y = (2/3)x - 1
      y = -x + 4

2.   x + y = 0
     3x + y = -4

3.  4x + 3y = -15
     y = x + 2

4.  x + 2y = -4
     4y = 3x + 12

5.   y = 2x
     x + y = 3

6.  x = 3 - 3y
     x + 3y = -6

7.  y = -2x + 1
     y = x - 5

8.  y = (1/2)x - 3
     y = (3/2)x – 1

9.   x + y = 2
     4y = -4x + 8

#2 2014-07-21 08:01:37

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,049

Re: Solving Systems of Equations Using Substitution Method and Elimination

Did you try any of thise? What did you get?


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
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#3 2014-07-21 08:17:46

ShivamS
Member
Registered: 2011-02-07
Posts: 3,648

Re: Solving Systems of Equations Using Substitution Method and Elimination

Just solve one of the equations for x or y and plug it in for x or y respectively in the other equation.

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#4 2014-07-21 12:41:20

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,974
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Re: Solving Systems of Equations Using Substitution Method and Elimination

http://www.mathisfunforum.com/viewtopic … 50#p154650

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