Question

Aflati x din proportiile : a) $\frac{x-3}{4}$ = $\frac{1}{2}$
b) $\frac{x - 14}{5}$ = $\frac{9 - x}{2}$

Va rog , cat mai repede !

Answer 1

a)
(x-3)/4=1/2
2(x-3)=4
2x-6=4
2x=10
x=5
b)
(x-14)/5=(9-x)/2
5(9-x)=2(x-14)
45-5x=2x-28
-5x-2x=-28-45
-7x=-73
7x=73
x=73/7

Answer 2

a ) ( x - 3 ) / 4 = 1 /  2 

2( x - 3 ) = 4 

x - 3 = 2 

x = 2 + 3 

x = 5 

b ) ( x - 14 ) / 5  = ( 9 - x ) / 2 

2( x - 14 ) = 5( 9 - x ) 

2x - 28 = 45 - 5x 

2x + 5x = 45 + 28 

7x = 73

x = 73 / 7