Question

A) x +2x=x+9
b)y+2y-5=11-y
c)3a+4=a-1+a+7
d)10-2b+6-b=10-b+4-b

Pilne!;)

Answer 1

A) x +2x=x+9
x+2x-x=9
2x=9/:2
x=9/2
x=4 i 1/2

b)y+2y-5=11-y
y+2y+y=11+5
4y=16/:4
y=4

c)3a+4=a-1+a+7
3a-a-a=-1+7-4
3a=2/:3
a=2/3

d)10-2b+6-b=10-b+4-b
-2b-b+b+b=10+4-6-10
b=-2

;))

Answer 2

A)2x=9/:2
x=4,5

b)3y-5=11-y
4y=16/:4
y=4

c)3a+4=a-1+a+7
a=2

d)10-2b+6-b=10-b+4-b
-3b+2b=14-16
-b=-2/*(-1)
b=2

Answer 3

A) x +2x=x+9
x+2x-x=9
2x=9
x=9/2
x=cztery i jedna druga

b)y+2y-5=11-y
y+2y+y=11+5
4y=16
y=4

c)3a+4=a-1+a+7
3a-a-a=-1+7-4
a=2

d)10-2b+6-b=10-b+4-b
-2b-b+b+b=10+4-10-6
-b=-2
b=2