Question

IN One day, Siri went to a book shop with her father and bought 3 notebooks and 2 pens. H father pad 80 for them. Her friend Laxmi liked the notebooks and pens. So, she too bough notebooks and 3 pens of the same kind for 110. Now her classmates Rubina liked the pe whereas Joseph liked the notebooks. They asked Siri the cost of the pen and the notebo separately. But, Siri did not know the costs separately. How will they find the costs of the problem in a while ago and charger and​

Answer 1

Answer:

Step-by-step explanation:

let notebook be x

and pens be y

3x+2y=80----(1)

4x+3y=110----(2)

now by elimination method

4(3x+2y=80)=12x+8y=360-(3)

3(4x+3y=110)=12x+9y=330-(4)

now eliminate (4) from (3)

12x+8y-360-(12x+9y-330)

=>17y-30=0

=>17y=30

=y=30/7=4.28

substitute y in eq(1)

3x+2(4.28)=80

3x+8.56=80

=3x=71.44

=x=71.44/3=28.3