If x+y−z=8 and x−y+z=12, then x=

x = 10

Step-by-step explanation:

We see and show that  x = 10

This makes y = 5 and z = 7 as 5-7 (y-z) = -2

As y5-z7 = -2 then we add 10 = 8

x+y-z = 10x-2yz = 8

x-y+z =  10 -5  +7 = 12  we know  x = 10

We cna now prove.

x+y-z =8

x+5y-7z = 8

x +-2yz = 8

x = 8+2yz

x= 10

And prove

(x-5y)+7z= 12

x-y =12-7z

x = 5+5y

x=10

as x-5 (=5+7z) = 12

Have got the right answer here. Hope it helps.

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.