3x+5y=7
6x-y= -8
2006-08-17 03:06:55 · 6 answers · asked by demeatriss 1 in Science & Mathematics ➔ Mathematics
{x=-1
{y=2
2006-08-17 03:17:59 · answer #1 · answered by Anonymous · 0⤊ 0⤋
x+y+z=2 so x=2-y-z so 2x = 4-2y-2z consequently 4-2y-2z -3y+z = -11 which we are able to simplify to -5y-z= -15 or 5y+z = 15 so z= 15-5y consequently -(2-y-(15-5y)) + 2y - (15-5y) =8 -(2-15-y+5y) +2y -15 +5y = 8 -(-13+4y)+7y-15 =8 13-4y+7y-15=8 -2+3y=8 3y=10 y=10/3 going lower back to the 1st equation, we are able to sparkling up for x x + 10/3 +15-5(10/3)=2 x+10/3 +15-sixteen-2/3=2 x+5/3=2 x=2-5/3 x=a million/3 then sparkling up for z a million/3 +10/3 +z = 2 z= 2-11/3 z=-5/3 ___________ in precis: x= a million/3 y= 10/3 z= -5/3 ___________ to double examine, plug them into the 1st equation a million/3 +10/3 -5/3 = 2 11/3-5/3=2 6/3= 2. . . yep!
2016-12-11 10:22:54 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Y=2
X=1
2006-08-17 03:11:13 · answer #3 · answered by bigbill4u 3 · 1⤊ 1⤋
y=8 and (7/5)
x=(-4/3) and (7/3)
2006-08-17 03:14:49 · answer #4 · answered by Akazani 2 · 0⤊ 0⤋
3...5...7
6..-1...-8
3...5....7
0..-11...-22 [2nd row - 2 * 1st row]
3...5....7
0...1...2 [2nd row divided by -11]
3...0...-3 [1st row subtract 5 * 2nd row]
0...1...2
1...0...-1 [1st row divided by 3]
0...1...2
Easy eh?
2006-08-17 03:32:27 · answer #5 · answered by Anonymous · 1⤊ 0⤋
Y=8+6X
3X+5(8+6X)=7
3X+40+30X=7
33X= -33 ------------>X= -1
Y=8-6 ---------------->Y= 2
2006-08-17 03:24:53 · answer #6 · answered by sea lover 2 · 1⤊ 0⤋