Friday

November 28, 2014

November 28, 2014

Posted by **jessica** on Sunday, May 6, 2007 at 10:11pm.

Solve by substitution

4x-12y=5

-x+3y=-1

I know that you have solve one of the equations. I have picked the second one so it would be y= -1/3+1/3x right??

Then I substitute 4x-12(-1/3+1/3x)=5.

Now I have no clue what to do from there. Please help.

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.If that right?

In the bottom, rearrange to read

x= 3y+1

Now put that value for x in the top equation...

4x-12y=5

4( 3y+1)-12y=5

then solve for y.

when you get y, go back and put it in

x= 3y+1 to get x.

I suggest you show your number as

y=[(x-1)/3

Then 4x -12[(x-1)/3] = 5

Then 4x -4(x-1) = 5

etc. I'm sure you can handle it from here.

**Answer this Question**

**Related Questions**

algebra - help me please im confused Consider the quadratic expression X^2 + 4x...

Algebra 1--Step-by-Step - Can someone show me how to solve these step-by-step? ...

Algebra - Can someone please help me with math problem and explain to me step by...

math - a rectangle is to be inscribed under the arch of the curve y = 2cosx from...

Algebra II- please help! - I just cannot seem to be able to grasp the concept of...

algebra - In finding distance problems i understand the use of formula of d/rt ...

Pre-Algebra - can someone show me how step by step to convert this problem 45 mi...

Physics - Can someone please show me step by step how to normalize e^-5x in the ...

PreCalculus II - perform the indicated operation (3sinx-2)(sinx+1) I need ...

algebra functions - can someone help me with this and explain it to me step by ...