Question

find two numbers whose sum is 75 and difference is 15 [use substitution method]

Answer 1

Answer:

let the numbers be x and y

Step-by-step explanation:

then ,

x+y=75 and x-y=15

by subtracting both we get

x+y=75

- x-y=15

________

0+2y= 60

y= 30

Thus x = 75-30

= 45

the two numbers are 45 and 30

Answer 2

Answer:

write a short note on cells