The total cost of 5 pens and 2 books is ₹150.while the total cost of 7 pens and 3 books is ₹219.Find the total cost of 3 pens and 1 book
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Answer:
5x+2y = 150
7x+3y = 219
3x+y = a
Step-by-step explanation:
2 (7x+3y = 219)
3 (5x+2y = 150)
14x + 6y = 438
15x + 6y = 450
= -x = -12
x= 12
5x + 2y = 150
60 + 2y = 150
2y = 150 -60
y = 45
3x+y
= 3× 12 + 45
36+45
=81
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