# Question #85ee6

##### 1 Answer

Oh, hey! I learned this last year!

A) SUBSTITUTION EQUATIONS

So, you will be given two equations.

Make

Make

Think carefully whether to substitute Equation 1 into Equation 2 OR Equation 2 into Equation 1.

Always look at two equations for like terms - you can see that both of these equations have a y.

Yes! You would rather substitute Equation 2 into Equation 1 because it's easier.

So, substitute the y in Equation 1 and it will give you

To solve

To expand the

Therefore,

So then it leaves you with 2x−3x+3=−1.

Send the +3 to the right hand side of equal sign and it will become -3.

[THAT'S NOT DONE YET! UNLESS IF YOU DON'T WANT FULL MARKS! (LOL)]

So now you've know that

So substitute 4 into

Option 1 (Substitute into Equation 1):

Now you have:

Therefore,

I'll show you how to do Elimination some other time.