Question

Va rog Help!!! ...pls

a) (2(X-3)=1-4(3+2X)
b) X la a 2a -5x+6=0
c) x+3y=7
2x-y= -1

Explicati cum ati facut !
Ms

Answer 1

a) 2(x-3)=1-4(3+2x)
2x-6=-11-8x
2x+8x=-11+6
10x=-5
x=-1/2

b) x²-5x+6=0
x=-(-5)±√(-5)²-4•1•6/2•1
x=5±√25-24/2
x=5±√1/2
x=5±1/2

x=5+1/2=3
x=5-1/2=2


c) x+3y=7
x=7-3y

d) 2x-y=-1
2x=-1+y
x=-1/2+y/3
x=-1+y/2