If you buy six pens and one mechanical pencil, it will cost $9. If you buy four pens and two mechanical pencils, it will cost $8
. How much does each pen and mechanical pencil cost?
if you let p=the cost of pen
m= the cost of mechanical pencil
6p+1m=$9
4p+2m=$8
p=? m=?
please help what do i do to find these variables? thank u
1 answer:
Use Substitution or Elimination
1. pick one equation and solve for a variable
6p + 1m = 9
1m = 9-6p
m = 9 - 6p/ 1
m= 9-6p
2. substitute m into one of the equations given
4p + 2 ( 9-6p) = 10
4p + 18 - 12p = 10
4p - 12p = 10 - 18
-8p = -8 (divide both sides by -8)
p = 1
3. Insert p=1 into any of the equations
6p+1m = 9
6(1)+1m =9
6 + 1m = 9
1m = 9-6
1m= 3
m = 3
You might be interested in
Another possible solution would be f(8)=4. I basically doubled it.
Answer:
r=C/2π
Step-by-step explanation:
C=2πr
C/2=πr
C/2π=r
Answer 76
Step-by-step explanation:
Answer:
2+32 (Or x)+16 = 50
Step-by-step explanation:
Each can costs 87 cents time 11 is 9.57(.87x)x=11