Question

express the following in linear equation in two variables. "The cost of a pencil is Rs.4 and one ball point pen costs Rs.30 sitha pays Rs.200 for the pencils and pens she purchased."

Answer 1

let number of pencil = x
and number of ball point pen = y

then ,
according to question ,

4x + 30y = 200

2x + 15y = 100

hence, linear equation of two variable is 2x + 15y = 100

Answer 2

let x be the number of pencil and y be the number of pen purchased
so total cost of pencil =4x
total cost of pen =30y
since she paid 200 rupee for both then
4x+30y=200
or
2x+15=100