Question

a)5.x-3-2.x=0 b)9.x=20+8.x c)4.x-2=7.x-14 d)16=15-9.y- 5 sobre 4

Answer 1

a) 5x - 3 - 2x =0
5x - 2x = 3
3x = 3
x = 3/3
x = 1

b) 9x =20+8x
9x - 8x = 20
x = 20

c) 4x-2 = 7x-14
4x-7x = -14 +2
-3x = -12
3x = 12
x = 12/4
x = 3

d) 16 = 15 - 9y -5/4
9y = 15 - 16 -5/4
9y = -1 - 5/4
9y = -4/4 - 5/4
9y = -9/4
y = (-9/4)/9
y = (-9/4)*(1/9)
y = -1/4

Answer 2

a) 5x-3-2x=0
5x-2x-3=0
3x=3
x=3/3
x=1

b)9x=20+8x
9x-8x=20
x=20

c) 4x-2=7x-14
4x-7x= -14+2
-3x=12. *(-1)
3x=-12
x= - 4

d) 16 = 15-9y-5
---------- ----------
1 /4. 4/1

64= 15-9y-5
9y=15-5-64
9y=10-64
9y= - 54
y= - 54/9
y = - 6