Question

(Ignorem a questão 2) me ajudem nessas equações!!

Answer 1

a)2x+(9-x)=8-(3x-6)
X+9= 8-3X+6
x+3x=8+6-9
4x=5
x=5/4
x=1,25

b)8*(2x-1)=6*(5x-2)-10
16x-8= 30x-12-10
16x-8=30x-22
16x-30x=-22+8
-14x=-14 (*-1)
14x=14
x=14/14
x=1

c)y-[y-(2-y)-1]+4=-(-3-y)
y-[y-2+y-1]+4 =3+y
y-[2y-3]+4 =3+y
y-2y+3+4=3+y
-y+7=3+y
-2y=3-7
-y=-4/2
y=2

d)2*(x-2)-3*(1-x)=20-(x-4)
2x-4 - 3+3x=20-x+4
5x-7= -x+24
6x=24+7
x=31/6
X=5,16