Question

a number described by 7 is 15 find the number.​

Answer 1

x + y = 15

- x - y = 7

2y = 8

2y/2 = 8/2

y = 4

x + 4 = 15

x + 4 - 4 = 15 - 4

x = 11

check

11 + 4 = 15

15 = 15

11 - 4 = 7

7 = 7

HOPE IT HELPS :D