Question

Calculati ecuatiile . Toate . cu verificare , si raspuns ... Va rog , du 30 puncte
z - 100 = -2012
x+70= -100
y + 8 = 2000
z + 29 = -718
3 * x = 81
(-11) * y = 121
(-35 ) * z = -210
x : (-8) = -20
y:38 =10
z : (-19) = -18
3x + 72 = 0
-8y + 800 =0

Answer 1

[tex]a) z-100=-2012\\z=-2012+100\\z=-1912\\V:-1912-100=-2012\\ b) x+70=-100\\ x=-100-70\\x=-170\\V:-170+70=-100\\ c) y+8=2000\\ y=2000-8\\y=1992\\V:1992+8=2000\\ d) z+29=-718\\z=-718-29\\z=-747\\V:-747+29=-718\\ e) 3*x=81\\x=81:3\\x=27\\V:3*27=81\\ f) (-11)*y=121\\y=121:(-11)\\y=-11\\V:(-11)*(-11)=121\\ g) (-35)*z=-210\\z=-210:(-35)\\z=6\\V:(-35)*6=-210\\ h) x:(-8)=-20\\x=(-20)*(-8)\\z=160\\V:160:(-8)=-20\\ i) y:38=10\\y=10*38\\y=380\\V:380:38=10\\ j) z:(-19)=-18\\ z=-18*(-19)\\z=342\\V: 342:(-19)=-18[/tex]
[tex]k) 3x+72=0\\3x=-72\\x=-72:3\\x=-24\\V:3*(-24)+72=-72+72=0\\ l) -8y+800=0\\-8y=-800\\y=-800:(-8)\\y=100\\V: -8*(100)+800=-800+800=0[/tex]