Question

answer me qution please ​

Answer 1

Answer:

this is all about pair of linear equation in two variable : )

Answer 2

Answer:

Step-by-step explanation:

income be 7x and 5x

expenditure is 9y and 8y

as we know

income-(expenditure+100) = savings  <increase exp>

Income-(expenditure -200)= savings <dec exp>

first

7x-(9y+100)=400

7x-9y-100=400

7x-9y=500

second

5x-(8y-200)=400

5x-8y+200=400

5x-8y=200

by eliminating 7x-9y=500 and 5x-8y=200

we get y=100 and x

as we know 7x-9y=500

so 7x-9(100)=500

7x-900=500

7x=500+900

7x=1400

x=200

so income are

7 (200)

=ruppes 1400

and 5x

5(200)

ruppes1000