This week in math 10 we learned how to solve equations with using elimination. Elimination in incredibly similar to using insertion.

The first step to solving something using elimination is to add or subtract. in this case I will use subtract.

7x+y=15

3x+y=3

I’m going to make all of the number in the second equation negative

7x+y=15

-3x-y=-3

Now to subtract. Note: when using elimination, make zero pares with x or y

4x=12

Now to divide by 4

X=3

We can then insert x back into the equation to find out y

7(3)+y=15

21+y=15

X=-6

my core competencies reflection:

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