Please help with math question!?!
Question: Please help with math question!?
6y - 6x = -42
x=
y=
Answers:
Perform substitution. In this equation set, the variables x and y are the SAME so.... you can carry them between the two equations. In this case, it's easy because you already have one variable solved for you, x.
You know that x = 2y+3, so... plug it into the 2nd equation to eliminate one variable, and we have:
6y - 6(2y+3) = -42
Distribute the -6
6y - 12y -18 = -42
Move/Combine like terms
-6y = -24
Divide both sides by -6
y = 4
Now that you know what y is, plug that back into the first equation to find x
x = 2(4) +3
x = 8 + 3
x = 11
x= 11
y= 4
Double check by pluging in the numbers into one of the equations if you're not sure.
This is a system of equations
Substitute the first equation into the second
6y-6(2y+3)=-42
6y-12y-18=-42
-6y=-42+18
y=-24/-6
y=4
Substitute y is = 4 in the first equation
x=2(4)+3
x=8+3
x=11
x=11, y=4
x = 2y + 3---> -2y = -x + 3----> y = 1/2 x -3
6y - 6x = -42-----> y = x - 7
setting them equal
x - 7 = 1/2 x -3-----> 1/2 x = 4--------> x = 8
Im almost positive X is 6 but i cant figure out Y i will keep trying or its gonna irritate me that i cant figure it out. hope that helps :)
~Lacie Lou :)
My 8th grade math class :)
damn son