3x - 3y = - 9
6x + 48 = y
2007-08-25 06:45:52 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
3x - 3(6x + 48) = - 9
3x - 18x - 144 = - 9
- 15x = 135
x = - 9
y = - 54 + 48
y = - 6
x = - 9 , y = - 6
2007-08-25 08:02:32 · answer #1 · answered by Como 7 · 1⤊ 0⤋
3x - 3y = - 9 => x - y = -3 =>x + 3 = y
6x + 48 = y
Substitute y = x+3 into 6x+48 = y:
x + 3 = 6x + 48
3 - 48 = 6x - x
- 45 = 5x
x = -9
Substitute x = -9 into y = x+3:
y = -9 + 3
y = -6
2007-08-25 13:54:09 · answer #2 · answered by Kemmy 6 · 0⤊ 0⤋
3x - 3y = - 9 --> x = y-3
Substitute x=y-3 into below equation.
6x + 48 = y
6(y-3) +48 = y
6y -18 +48 = y
5y = -30
y= -6
Put y = -6 in 1st equation getting:
3x-3(-6) = -9
3x +18 = -9
3x = -27
x = -9
2007-08-25 14:01:07 · answer #3 · answered by ironduke8159 7 · 1⤊ 0⤋
3x - 3y = -9
substitute value of y in above equation
3x - 3(6x + 48) = -9
3x -18x - 144 = -9
-15x = -9 + 144
-15x = 135
x = 135 / -15
= -9
Answer: x = -9 y= 6(-9) + 48= -6
2007-08-25 14:00:51 · answer #4 · answered by Cranky 2 · 0⤊ 0⤋
You have: y=6x+48
Substitute this into the first equation:
3x-3(6x+48)=-9 <=>
3x-18x-144=-9 <=>
-15x=135 <=>
x=-135/15=-9
y=6(-9)+48=-54+48=-6
2007-08-25 13:55:55 · answer #5 · answered by Anonymous · 0⤊ 1⤋
3x-3y= -9 (given)
or, x-y= - 3 (i)
therefore, y= x+3 (from i) ...(ii)
Given, 6x-y= -48 (iii)
or, 6x - x - 3= - 48 (from ii)
or, 5x= - 45
x= - 9
Putting value of x in (ii), we get,
y = -9+3 = - 6
Answer : x = -9
y= -6
2007-08-25 14:01:03 · answer #6 · answered by Ria 1 · 0⤊ 0⤋
x=y-3 (1)
6x+48=y (2)
6(y-3)+48=y
6y-18+48-y=0
5y=-30
y=-6 ... y-value
3x-3(-6)=-9
3x+18=-9
3x=-27
x=-9 ... x-value
2007-08-25 13:48:57 · answer #7 · answered by de4th 4 · 0⤊ 0⤋