Question

Solve by using matrix method: cost of 10 pencils and 3 pen is rs. 160 and cost of 6 pencils and 8 pens is rs.220,find the cost of pen and pencil using matrix method.

Answer 1

Answer:

y=20,x=10

Step-by-step explanation:

10x+3y=160        .....1

6x+8y=220        ....2

using substitution method

6(10x+3y=160)   ....3

10(6x+8y=220)    ....4

now,

substract eq. 3and 4

60x+18y=960

60x+80y=2200

then,

y=20

and x=10