Question

3 X + 7 Y =105, 9X-7Y=108 slove in substation method

Answer 1

Answer:

Step-by-step explanation:

3x=105-7y

x=105-7y/3........1)

9x-7y=108...........2)

Put the value of eqn 1 in eqn 2

9*105-7y/3 - 7y=108

945-63y/3 - 7y=108

945-63y-21y=108*3

945-84y=324

-84y=324-945

-84y=-621

y=621/84

x=105-7y/3

x=105-7*621/84*3

x=1053/2