Friday

July 25, 2014

July 25, 2014

Posted by **Anonymous** on Saturday, January 5, 2013 at 3:24pm.

-7x+8y=-5

- solving equations by sibstitution -
**San**, Saturday, January 5, 2013 at 3:46pmmultiply the top by positive 8 and multiply the bottom by negative 6. then cancel out the y's and solve for x. plug x back into anyone and solve for y.

- solving equations by sibstitution -
**Steve**, Saturday, January 5, 2013 at 3:56pmhmm. sounds like elimination to me.

For substitution, pick either equation and solve for x (or y):

-2x+6y=6

6y = 2x+6

y = x/3 + 1

Now substitute that into the other equation:

-7x+8y = -5

-7x + 8(x/3 + 1) = -5

-7x + 8x/3 + 8 = -5

-13x/3 = -13

x = 3

so, y = x/3+1 = 2

be sure to plug (3,2) into the original equations to make sure you (or I!) didn't make a mistake.

**Related Questions**

algebra attn Reiny - Thanks for your help with the solving of the three ...

Chemistry - When solving Hess law problems,do we need to use all the equations ...

MATH - I've been having problems with solving equations that involve fractions ...

Business Algebra - Produce an example of a system of equations to your fellow ...

Solving Equations with variable on Both Sides - I need help solving this. I've ...

Algebra - Explain the difference between solving a linear equation graphically ...

solving equations fractions - how do i go about solving equations fractions?

algebra - Explain the difference between solving a system of equations by the ...

Math - Please help me about solving kuadratic equations: X^2-2(1-3m)x+7(3+2m)=0 ...

Algebra - Solving systems of linear equations in 3 variables... 1) 3x-2y+2z=1 2...