2007-09-18 14:57:11 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2y + (3y - 3) = 9
5y - 3 = 9
5y = 12
y = 12 / 5
x = 36 / 5 - 3
x = 36 / 5 - 15 / 5
x = 21 / 5
x = 21 / 5 , y = 12 / 5
2007-09-19 06:53:15 · answer #1 · answered by Como 7 · 2⤊ 0⤋
2y + x = 9
x = 3y - 3
We know x = 3y - 3, so put that in for x in the first equation and solve for y.
2y + x = 9
2y + 3y - 3 = 9
5y - 3 = 9
5y = 12
y = 2 2/5
Then use this answer to find x.
2(2 2/5) + x = 9
4 4/5 + x = 9
x = 4 1/5
2007-09-18 15:05:05 · answer #2 · answered by sfroggy5 6 · 0⤊ 0⤋
You have x=3y-3
so just substitue that in for the x in the first equation:
2y+(3y-3)=9
2y+3y-3=9
5y=12
y=12/5
Then plug that back in and solve for x
x=3(12/5)-3
x=36/5-15/5
x=21/5
Then put these both into the first equation to check your answer:
2(12/5)+21/5=9
24/5+21/5=9
45/5=9
9=9
2007-09-18 15:01:24 · answer #3 · answered by Patty C 3 · 0⤊ 0⤋
2y + 3y - 3 = 9
5y - 3 = 9
5y = 12
y = 12/5
x = 3*12/5 - 3
x = 36/5 - 3
x = 36/5 - 15/5
x = 21/5
2007-09-18 15:07:40 · answer #4 · answered by Steve B 6 · 0⤊ 0⤋
2y + (3y-3)=9
2y + 3y +3=9 + 3
2y + 3y +3=12
5y + 3 = 12
5y-3= 12-3
5y=9
y=9/5 or 1 4/5
I think this is right....haven't had algebra in quite a while, but I thought it would be fun to give it a shot!
2007-09-18 15:04:25 · answer #5 · answered by humanbeforeamerican 3 · 0⤊ 1⤋
put the (3y - 3) in for x.
you would get
2y + 3y - 3 = 9
5y = 12
y = 12/5
hope this helps.
2007-09-18 15:07:33 · answer #6 · answered by c_greiff 3 · 0⤊ 1⤋
yea you can rewrite it as 2y+3y-3=9
solve for y and then with that info find out x
2007-09-18 15:00:48 · answer #7 · answered by dauntless 1 · 0⤊ 0⤋
ok.... you know that it's the same as 2xy+x=9 so,the process of operations means that: it could be: 2x3+3=9 or 2x4+1=9
2007-09-18 15:03:41 · answer #8 · answered by Hope Solo 3 · 0⤊ 0⤋