Y= -x-4
3x= - x-4
4x= - 4
x = -1
y= - 3
(-1; -3)
(8+12):4-2=3 8+(12:4)-2=9 8+12:(4-2)=14 (9+6):3-2=3 9+6:(3-2)=15 9+(6:3)-2=9
(X+3)*5= 725
5x+ 15=725
5x= 725-15
5x= 710
X=142
A) 30/100=0,3=1%;
5%=<span>0,3*5=1,5
</span>Б) 140/100=1,4=1%;
5%=<span>1,4*5=6
</span>В) 1000/100=10=1%;
5%=10<span>*5=50
</span>