x+5=y 2(x+1)=y+3 x=y-5 2x+2=y+3 x=y-5 2(y-5)+2=y+3 x=y-5 2y-10+2=y+3 x=y-5 2y-8=y+3 x=y-5 2y-y=3+8 x= y-5 y=11 x=11-5 y=11 x=6 y=11 b) b-5=a (b-1)=(a-b)·2 b=a+5 (a+5)-1=2a-2(a+5) -a-5=2a-2a-10 -a-5=-10 -a=-10+5 -a=-5 a=5 b=a+5 b=5+5 a=5 b=10
[latex]1) \ left { {{x+5=y} atop {2(x+1)=y +3}} ight. \ left { {{y=x+5} atop {2x + 2 = x+5 + 3}} ight. \ left { {{y = x+5} atop {2x - x = 8-2}} ight. \ left { {{y = x+5} atop { x =6}} ight.\ left { {{x=6} atop {y=6+5}} ight. \ left { {{y=11} atop {x=6}} ight. \ [/latex] [latex]2) \ \ left { {{a=b-5} atop {(b-1)=(a-b)*2}} ight. \ left { {{a=b-5} atop {b-1=2(b-5)-2b}} ight. \ left { {{a=b-5} atop {b-1=2b-10-2b}} ight. \ left { {{a=b-5} atop {b-1=-10}} ight. \ left { {{a=b-5} atop {b=-9}} ight. \ left { {{b=-9} atop {a= -9-5}} ight. \ left { {{b=-9} atop {a= -14}} ight. [/latex]
