Question

find cost of audio or video cassette

Answer 1

Answer:

x= 30 y= 300

Step-by-step explanation:

7x+3y=1110...............1

5x+4y=1350.............2

multiply eq1 with 5 and eq2 with 7

35x+15y= 5550

35x+28y= 9450

-___-____-_________

0    - 13y  = -3900

y= 300

putting value of y in eq1

7x+3(300)=1110

7x+900=1110

7x=210

x=30