Solve the system of equations using the elimination method. Enter the answer as an ordered pair.
x + y = 9
x - y = 7
Can you show work too or how you get the answer? thank you
2007-07-10 12:59:32 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Hi, this is very simple. I will take step by step instructions.
Since the y's are oposite signs they cancel. The x's and the 7 and 9 add together.
making this: 2x=16.
Now divide the 2 by both sides and you get x=8.
Now you go back to either one of the original equations and plug in the 8.
Your answer is y=1. Mainly when divideing 9 and 8 and 7 and 8 you get number that can just be rounded to 1.
So final answer is: (x, y) (8, 1)
2007-07-10 13:19:06 · answer #1 · answered by Dogna M 4 · 0⤊ 0⤋
Here, we are in luck, since if you add the two equatinos together (left side of each together, then right side of each together), the y's are eliminated! (They add to zero). So we are left with:
2x + 0 = 16, which is easily solved to get x = 8, and then you can plug this into either equation to find y = 1. You can check the answer by plugging them into both equations.
2007-07-10 13:08:13 · answer #2 · answered by Anonymous · 1⤊ 0⤋
This is fairly easy.
The y values will add to zero if added. Which will eliminate them.
So you add the equation together. Leaving you with 2x=16
Simplify that to get x=8.
Plug that into either original equation.
8-y=7. y=1
Do it to the other just to double check.
8+y=9. y=1
2007-07-10 13:09:33 · answer #3 · answered by Flac 2 · 0⤊ 0⤋
not possible
2007-07-10 13:10:29 · answer #4 · answered by vanessa 6 · 0⤊ 3⤋