# Math 8R - HELP!

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Multi-Step Equations
Systems of Equation

2x = y
4x - y = -2

• Math 8R - 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

• Math 8R - HELP! -

thank you ....

2x + 4y = 24
x - 2y = -8

my mom tried helping me but didn't understand it....

• Math 8R - HELP! -

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 (2y-8) into the other equation
2(2y-8) + 4y = 24
4y - 16 + 4y = 24
8y = 24 + 16
8y = 40
y = 40/8 = 5

now plug that into
x = 2y-8
x = 2(5)-8 = 2

so x=2, y=5

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