Posted by Laruen on Tuesday, January 29, 2013 at 8:54pm.
MultiStep Equations
Systems of Equation
2x = y
4x  y = 2
please help!!!!!

Math 8R  HELP!  Reiny, Tuesday, January 29, 2013 at 9:09pm
I would use substitution
sub the 1st into the 2nd
4x  y = 2
4x  (2x) = 2
2x = 2
x = 1
then back into the first
y = 2x
y = 2(1) = 2

Math 8R  HELP!  Laruen, Tuesday, January 29, 2013 at 9:25pm
thank you ....
2x + 4y = 24
x  2y = 8
my mom tried helping me but didn't understand it....

Math 8R  HELP!  Reiny, Tuesday, January 29, 2013 at 9:31pm
For your second example I would use substitution again
Notice that in the second equation the x variable is all by itseld, that is, it is 1x understood.
That is the key.
look for a variable like that and solve for it
x  2y = 8
x = 2y  8
now sub that x value of (2y8) into the other equation
2(2y8) + 4y = 24
4y  16 + 4y = 24
8y = 24 + 16
8y = 40
y = 40/8 = 5
now plug that into
x = 2y8
x = 2(5)8 = 2
so x=2, y=5
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