a bottle contains red marble and blue marbles. a marble is chosen at random and not replaced. then a second marble is chosen at
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Remember that X will always be one up or down depending on if there is a - or not (if it is just an x) and one over! Hope this helps
In order to use the elimination method, we have to multiply the equation by some number, so that one of the variable has the same coefficient.
For example, multiplying the first equation by 3 and the second by 2 gives the following, equivalent system:
Now, we can subtract the two equations, and we will cancel (eliminate) the x variable:
Now that y is known, plug it into one of the equations: for example, if we use the first one we get