SOLUTION: Solve using addition and multiplication principals. 5 + 4x < 21 The solution set is {x/x ??} Solve the following system of equation x + 4y = 2 (1) x = 7 -4y (2) What

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Question 148484: Solve using addition and multiplication principals.
5 + 4x < 21
The solution set is {x/x ??}

Solve the following system of equation
x + 4y = 2 (1)
x = 7 -4y (2)
What is the soltution of the system?

Found 2 solutions by jim_thompson5910, ikleyn:
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
Solve using addition and multiplication principals.
5 + 4x < 21
The solution set is {x/x ??}


Start with the given inequality.


Subtract from both sides.


Combine like terms on the right side.


Divide both sides by to isolate .


Reduce.


----------------------------------------------------------------------

Answer:

So the answer is


So the solution set is


Which in interval notation is




Solve the following system of equation
x + 4y = 2 (1)
x = 7 -4y (2)


Start with the given system





Plug in into the first equation. In other words, replace each with . Notice we've eliminated the variables. So we now have a simple equation with one unknown.


Combine like terms on the left side


Subtract 7 from both sides


Combine like terms on the right side

Since this equation is never true for any y value, this means there are no solutions.

Answer by ikleyn(52798)   (Show Source): You can put this solution on YOUR website!
.
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