Question

if 8 pens and 7 pencils cost $3.37 while 5 pens and 11 pencils cost $3.10, how much does each pen and pencil cost?

Answer 1

@babystar16 do you want me to show you how to solve?

Answer 2

plzzzzzzzzzzzzzzz

Answer 3

So we can setup system of linear equation.

Answer 4

P = Pens
C = Pencils

Answer 5

8p+7c=3.37
5p+11c=3.10

Answer 6

@babystar16 can't we multiply both of the 'p' variables to get a common number? Lets multiply the 8p times -5. Then the 5p times 8.

Answer 7

-40p-35c=-16.85
40p+88c=24.80
------------------ (Now, we add...)
53c = 7.95
c = .15

Answer 8

@babystar16 do you understand this?

Answer 9

Now, just plug back in .15 for c in the original equation.

Answer 10

5p+11(.15)=3.10
5p + 1.65 = 3.10
5p = 1.45
p = .29

Answer 11

Pens were .29 cent
Pencils were .15 cent

Answer 12

thank u

Answer 13

thank u for helping me understand it