Question

d) x-y=7 solve the following by
x+y=13 substitution method​

Answer 1

Answer:

x-y=7

x=7+y

put x= 7+y in second equation

7+y+y=13

7+2y=13

2y=6

y=3

x=10

Answer 2

Answer:

x-y=7 ------- i

x+y=13 -------- ii

from eq I x=7+y

now putting the value of x into eq Il

7+y+y=13

2y=13-7

2y=6

,y=3

x=7+3. =10

★«x»=10

★«y»=3