Question

solve by elimination method.
x+y=15 and 3x-y=21
step by step explanation​

Answer 1

Step-by-step explanation:

x+y=15...1

3x-y=21...2

solving equation no 1& 2 we get that

x+y+3x-y=15+21

4x=36

x=9

putting value on equation no 1

9+y =15

y=6