Question

solve by substitution method
X+y=18, x-y=4​

Answer 1

Answer:

x+y=18...... (1)

x-y=4.......... (2)

x-y=4

x=4+y........ (3)

from eq. (3)

x+y=18

4+y+y=18

4+2y=18

2y=18-4

y=14/2

y=7

putting the value of y=7 in eq. (3)

x=4+y

x=4+7

x=11