Maths

Solve the following equations for x if m =9,n = 2 and l = 7.

(a) m-x =1
9-x =1
9 -1 = x
x = 8

(b) 4x-3= m
4x-3= 9
4x= 9 + 3
4x= 12
x = 12/4
x = 3

(c) 2(x-1)=m
2(x-1) = 9
2 x -2 = 9
2x = 9+2
2x = 11
2x = 11/2
x = 5.5

(d) 2x+3=3m-4n
2x+3 =3(9) - 4(2)
2x =27 – 8 – 3
2x = 16
x = 16/2
x = 8

(e) 不知道是 (x分之m) , 還是x分之 (m + n +l)

x分之(m+n+1) = m-1+n
x分之9 +2+7=9-7+2
x分之18 = 4
18/x = 4
18 =4x
x = 18/4
x = 4.5

(x分之m) + n +1 = m-1+n
x分之9 +2+7=9-7+2
x分之9 + 9 = 4
9/x = 4 - 9
9/x =-5
9 = -5x
5x = -9
x = -9/5
x = -1.8

(f) x+2x+3x+4x=m+1-3n
x+2x+3x+4x = 9+7-3(2)
10x = 10
x = 10/10
x = 1

(g) 2x+mx =lx+8n
2x +9x = 7x +8(2)
11x = 7x + 16
11x – 7x = 16
4x = 16
x = 16/4
x = 4

Solve the following equations for x if m =9,n = 2 and l = 7.

(a) m-x=1
9-x=1
-x=1-9
-x=-8
x=8
(b) 4x-3=m
4x-3=9
4x=9+3
4x=12
x=3
(c) 2(x-1)=m
2x-2=9
2x=9+2
2x=11
x=5.5
(d) 2x+3=3m-4n
2x+3=3(9)-4(2)
2x+3=27-8
2x+3=19
2x=19-3
2x=16
x=8
(f) x+2x+3x+4x=m+1-3n
10x=9+1-3(2)
10x=10-6
10x=4
x=0.4
(g) 2x+mx=lx+8n
2x+9x=7x+8(2)
11x=7x+16
11x-7x=16
4x=16
x=4

Hope I can help you ^v^