Homework Help: Substitution Method-Plz help

Posted by Svetlana on Tuesday, October 17, 2006 at 3:34pm.

Use the Substitution method to solve the system of equations.

x + y = -4
x - y = 2

solve for x in the second equation.

x= y+2

Put that in for x in the first equation:
x+y=-4
(y+2) + y = -4
solve for y. Then, x= y+2

i don't get it.How did you get that?What does x equal?

re read my post. I tell you how I got it. you will have then to solve for x, then, put that value of x back in the equation, and solve for y. Post your work.

does x =5?

i have been trying to
figure out how to solve this
problem but i just can't.
it seems so difficult.
i have already seen some
examples but i still don't
understand!!

SOLVE USING THE SUBSTITUTION METHOD.

EX. x+y=4
y=2x+1

please help in the easiest way.
thanks a lot!
:]]]

Hi! Very nice site! Thanks you very much! YesXL2semgOs

teach me how to do this

x=2y+7
x=y+4

Hello! Good Site! Thanks you! ppgtnmkpvtl

Substitution Method-Plz help - Anonymous, Friday, March 8, 2013 at 8:04am
To solve the system given below using substitution, it is best to start by solving the first equation for y.

11x + y = 12
9y + 3x = 7

can you please explain please :)

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