the 3 bags 4 pens cost 257 rupees . where's 4 bags and 3 pens together cost 324 rupees.find the cost of a bag and 10 pens.please help me this question cramer rules mthed or inversion thanks
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Let the cost of 1 bag be x
And 1 pen be y.....
Now
3x + 4y = 257. Eq 1
4x + 3 y = 324. Eq2
Add eq 1&2and multiply it by 3&4 resp
12x + 16y = 1028
12x + 9y = 972
- - -
______________
7y=56
y=8
Cost of 10 pen is Rs 80
And
3x +4y =257
x = 225/3
X = Rs 75
And 1 pen be y.....
Now
3x + 4y = 257. Eq 1
4x + 3 y = 324. Eq2
Add eq 1&2and multiply it by 3&4 resp
12x + 16y = 1028
12x + 9y = 972
- - -
______________
7y=56
y=8
Cost of 10 pen is Rs 80
And
3x +4y =257
x = 225/3
X = Rs 75
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