Question

4)if equals are added to equals the wholes are equal
I know the answer of question 4 but I don't know how it come please tell me​

Answer 1

.So, it's something like this

Let x + y = 10. be first equation ...

Let z + y = 10 be second equation..

Since x = z, substitute x in the second equation..

which gives z + y = 10 ==> x + y = 10..

hope this helps ☺️

Answer 2

Answer:

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