Question

Hi..I have a final on Wednesday and I have a question about system of equation:

x-y=-1
x^2-y=5

Please help! Thanks!

Answer 1

Whats the question? Solve using substitution and factor. You'll have a lot of answers cause of +,- when you sqrt.

Answer 2

take value of x=-1+y
and put in second equation

Answer 3

Thank you guys! I will try again! :)

Answer 4

\[x-y=-1\iff x+1=y\]\[ x^2-y=5 \]
\[x^2-(x+1)=5\]might be easiest

Answer 5

Alternate method is to subtract the two equations. That will allow the y values to cancel, and leave you with a quadratic in x. Find the roots, then substitute to find the y values.

Answer 6

The answers at the back of the review say: (-2,-1), (3,4)

Answer 7

I like that! Thank you AnimalAin :)

Answer 8

No sweat. Make sure you are careful with the signs, and it will come out to the same quadratic Sattellite73 has directly above my post.

Answer 9

Thank you everybody! you are the best!

Answer 10

I think I got it..

Answer 11

Many ways to solve systems, pick a few that you like and study those. I like to use
elimination method first, graphing method second, substitution when I have to.

Answer 12

aww..Thank you good advice! :)

Answer 13

Always check your solution, no matter what method you use, it has to work for both equations or (all)