3x + 5y = -10
3x - 5y = 5 is it.....
A. 0
B. 1
C. infinitely many
2007-04-27 07:12:28 · 6 answers · asked by Lizza C 1 in Education & Reference ➔ Homework Help
3x + 5y = -10 ..........(1)
3x - 5y = 5 ...............(2)
Add the equations:
6x = -5
x = -5/6
Subtract (2) from (1):
10y = -15
y = -3/2
B. One pair of solutions.
2007-04-27 09:57:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋
There's just 1 solution:
Subtract the second equation from the first to get
10y = -15
y = -3/2.
Then 3x+15/2 = 5 = 10/2
3x = -5/2
x = -5/6.
Check: -5/2 -15/2 = -20/2 = -10,
so the first equation is satisfied.
So the unique solution is (-5/6, -3/2).
2007-04-27 18:17:11 · answer #2 · answered by steiner1745 7 · 0⤊ 0⤋
I am working on it right now, bear with me.
Just because you can use fractions, doesn't mean there will be an infinite amount of answers... she is wrong.
THE ANSWER: ONE SOLUTION (X = -5/6; Y = -1.5)
I AM RIGHT! If you have more than one equation, there can only be one set of correct variables to make both true. Sorry guys, you better get back to HS Algebra!
2007-04-27 14:16:09 · answer #3 · answered by Anonymous · 0⤊ 0⤋
There would be infinitely many, but these two lines only intersect in one place. These are the equations you asked about graphing, so is that what you are looking for?
2007-04-27 14:28:43 · answer #4 · answered by ar5 2 · 0⤊ 0⤋
i'm really thrown off with this one...usually when you have an infinitely many solution the equations are identical...
are you solving for x or y?
2007-04-27 14:24:42 · answer #5 · answered by Shrimptastic 1 · 0⤊ 0⤋
C because you can use fractions
2007-04-27 14:15:49 · answer #6 · answered by tracymoo 6 · 0⤊ 1⤋