Question

9. The cost of 2 pens and 3 pencils is * 45 and the cost of 3 pens and 4 pencils is *50. These can be represented in form of pair of equations as .... ?
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Answer 1

Step-by-step explanation:

pen = 30

pencil= 35

let's take pen as x ,pencil as y

2x + 3y = 45 -----(1)

3x + 4y = 50 -----(2)

(1)*3 ,(2)*2 multiply

6x + 9y = 135-------(3)

6x + 8y = 100-------(4)

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y = 35

substitute y value in (4),

6x +8(35) =100

x = 30