Question

what is the ans
Please tell me

Answer 1

Answer:

i will tell you the last one

Step-by-step explanation:

let the cost of pen be x

let the cost of pencil be y

so,first equation is 6x+4y=60 -(i)

and second equation is x+4y=40 -(ii)

let's solve it :-

solving method substitution

from equation -(ii)

x+4y=40

x=40-4y,put this x value in equation (i)

equation (i)

6x+4y=60

6(40-4y)+4y=60

240-24y+4y=60

240-20y=60

-20y=60-240

-20y=-180

y=180/20

y=9,so we have y's value,then put into equation (ii)

equation (ii)

x+4y=40

x+4(9)=40

x+36=40

x=40-36

x=4

value of x is 4 and y is 9

here is the full answer step by step