Question

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Answer 1

where you see one equation substituted in other one in place of x ?

Answer 2

the last option

Answer 3

no there are made equal

where you see the first one substituted in place of x inside the second one ?

Answer 4

or viceversa ?

Answer 5

@supie

Answer 6

instead of the 2 so the 3rd one

Answer 7

the 3rd one is correct but there is again right - look pls again

Answer 8

on the first one what you see ?

Answer 9

the first choice

Answer 10

it has the last part changed

Answer 11

the first choice is correct too
the first equation is substituted in place of x inside second equation

Answer 12

check it pls

Answer 13

but you can only pick one

Answer 14

no every what are correct

Answer 15

ok let to be the first step what you wrote the 3rd choice

Answer 16

so it is the 3rd one?

Answer 17

yes