Question

using brackets,write three pairs of numbers whose sum is 13.use them to write three equalities.

Answer 1

(9,4), (10,3), (6,7)
I don't really know what you mean by equalities. If u mean equations or something, here they are. Tell me what u mean in comments.
9x+4=13
10x+3=13
6x+7=13

Answer 2

Answer: The answer will be (10,3) ; (5,8) ; (7,6)

Step-by-step explanation:

You want 3 pairs of numbers whose sum is 13.

so if we add 10 and 3, the sum is 13.

if we add 5 and 8 , the sum is 13.

and if we add 7 and 6, the sum is 13.

Now there can be lot of pairs for this but I have chosen these three.

Equations can be like below:

10x+3=13

5x+8=13

7x+6=13