Question

Oblicz równanie i sprawdź je .

a) 5y+1=2(y-5)
b)0,1+(5 - 3y) = x

Answer 1

A) 5y+1 = 2(y-5)
5y + 1 = 2y -10
5y-2y= -10 - 1
3y = -11/:3
y= -11/3 

Spr. 5*(-11/3) + 1 = 2(-11/3-5)
-55/3 + 1 = -22/3 - 10
-17 i 1/3 = -7 i 1/3 - 10
-17 i 1/3 = -17 i 1/3 

b) 0,1(5- 3x)=x
0,5 - 0,3x = x
-0,3x - x = -0,5
-1,3x = -0,5 /:(-1,3)
x= 5/13

Spr. 0,1(5-3*5/13)=5/13
0,5 - 15/130 = 5/13
5/10 - 15/130 = 5/13
65/130 - 15/130 = 5/13
50/130 = 5/13
5/13 = 5/13