Question

rezolvati in Z; a) 4(3X+2)+3(2X+3)-28=7(2x+5)+6; b) (2x+7)=9; c)4x-5y=25 SI (X) <12

Answer 1

a) 12x + 8 + 6x + 9 - 28 = 14x + 35 + 6
18x - 14x = 41 + 11
4x = 52
x = 52 : 4
x = 13
b) 2x = 9 - 7
x = 2 : 2
x = 1
c) 4x - 5y = 25
si x < 12
x = 5
20 - 5y = 25
5y = - 5  = >   y = - 1
x = 1
- 5y = 25 - 4
Y = - 21/5
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