Math 8R  HELP!
posted by Laruen on .
MultiStep Equations
Systems of Equation
2x = y
4x  y = 2
please help!!!!!

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 
thank you ....
2x + 4y = 24
x  2y = 8
my mom tried helping me but didn't understand it.... 
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