My faces are not all congruent. I contain 12 edges. I contain 6 faces.
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This is a system of equations, and I am assuming that you are being asked to solve it.
This is finding the point where these two lines intersect.
The key to solving these algebraically is finding one part in terms of another part and substituting.
We can solve this system by Gaussian elimination, first by multiplying the second equation in its entirety by 2, so that the x-terms will cancel.
We have
and
.
The last equation is rewritten as
.
Now, we cancel the x-terms.
We have our value for y, so we just plug this back into any of the original equations to get x.
Thus, the solution to the system of equations is the point
.
This is finding the point where these two lines intersect.
The key to solving these algebraically is finding one part in terms of another part and substituting.
We can solve this system by Gaussian elimination, first by multiplying the second equation in its entirety by 2, so that the x-terms will cancel.
We have
and
The last equation is rewritten as
Now, we cancel the x-terms.
We have our value for y, so we just plug this back into any of the original equations to get x.
Thus, the solution to the system of equations is the point