Question

How do I use elimination, and substitution? I get it, somewhat, But i need to scrub up on it!

Answer 1

Elimination:
Ax+B=C
Dx-B=F
__________
now add the equations to get (Ax+Dx)=(C++F) because the +/- cancels itself.

Answer 2

substitution means you "substute the value of one variable from another equaiton

Answer 3

Substiution is when you plug in something - we need to equations for it. For example, y + x = 530 and 5(x) + 3.75(y) = 2412.50. Then we can substitute 530 -x = y for why..leaving us to: 5x + 3.75( 530-x) = 2412.50. Thats Substitution

Answer 4

Substitution:
Ax+By=C
Dx=y
________
substitute y into the first equation to get Ax+B(Dx)=C

Answer 5

elimination is usually done when you can see that the differnce between 2 coefficients is a small factor (mult)..whereas subsitution is the more general methodi.e. works for non linear cases as well

Answer 6

Elimination is when you have 2 equations that can cancel one of the variables.
Like
- y + 2x = 6
+ y + 7x = 13 w

you can see that - y from the top expression can be cancelled out with the bottom postive y. then we add the x terms and constant terms to give us one variable. then we can use it to solve for the other variable as for Y by pluging in for ONE of the eany equation