The cost of 6 pens and 3 pencils is 81. Eight times the cost of a pencil is 12 more than the cost of a pen. Form the pair of linear equations for the above situation. Find the cost of a pen and a pencil.
pls help.. if h don't know pls don't answer
pls help.. if h don't know pls don't answer
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Answer:
Let the cost of a pen and a pencil be x and y respectively.
4x+4y=100
x+y=25 ...(1)
3x=y+15
3x−y=15 ...(2)
Adding (1) and (2), we get
4x=40
x=10
Substitute x=10 in equation (1) to get y=15.
Let the cost of a pen and a pencil be x and y respectively.
4x+4y=100
x+y=25 ...(1)
3x=y+15
3x−y=15 ...(2)
Adding (1) and (2), we get
4x=40
x=10
Substitute x=10 in equation (1) to get y=15.