a:4x+9=7
b:2n+10-4n=18
c:4x+25-2x+25=6
2007-03-11 00:28:22 · 4 answers · asked by tony t 1 in Science & Mathematics ➔ Mathematics
a:4x+9=7
4x=-2
x=-0.5
b:2n+10-4n=18
-2n=8
n= -4
c:4x+25-2x+25=6
2x= -44
x= -22
2007-03-11 00:33:33 · answer #1 · answered by A 150 Days Of Flood 4 · 0⤊ 0⤋
a.
4x+9= 7
4x= 7-9 (bring +9 over to the left it becomes -9)
x= -2/4 (bring 4 over it becomes divided by 4)
x= -1/2
b.
2n+10-4n= 18
2n-4n+10= 18
-2n= 18-10
-2n= 8
n= 8/-2
n= -4
c.
4x+25-2x+25= 6
4x-2x+25+25= 6
2x+50= 6
2x= 6-50
x= -44/2
x= -22
2007-03-11 01:35:09 · answer #2 · answered by Stephanie K 2 · 0⤊ 0⤋
Solutions:
a)
4x + 9 = 7
4x = 7 - 9
4x = -2
x = -2 / 4
x = -1 / 2
b)
2n + 10 - 4n = 18
10 - 2n = 18
10 = 18 = 2n
-8 = 2n
n = -8 / 2
n = -4
c)
4x + 25 - 2x + 25 = 6
2x + 50 = 6
2x = 6 - 50
2x = -44
x = -44 / 2
x = -22
2007-03-11 00:34:50 · answer #3 · answered by shadcode 2 · 0⤊ 0⤋
a:4x+9=7
adding -9 both sides
4x+9-9=7-9
4x=-2
x=-1/2
b:2n+10-4n=18
rearrange the equation
2n-4n+10-18=0
-2n-8
-2n=8
n=8/(-2)
n=-4
c:4x+25-2x+25=6
rearrange the equation
4x-2x+25+25=6
2x+50=6
2x=6-50
2x= -44
x= -44/2
x= -22
2007-03-11 01:04:02 · answer #4 · answered by Ali 3 · 0⤊ 0⤋