163k views
0 votes
solve algebraically: lara bought 2 pencils and a eraser for $1.50. if a pencil costs 30 cents more than an eraser, how much does a pencil cost ?

2 Answers

6 votes
change $1.50 to 150 cents
150= 2(x+30) +x
150= 2x +60 + x
150-60 = 2x +x
90= 3x
90/3=x
x= 30
30+30= 60
One pencil cost 60 cents
User Shalin
by
8.0k points
2 votes
2p+e=1.50
p=0.30+e
to make it easier
minus 0.30
p-0.30=e

sub p-30 for e
2p+p-0.30=1.50
3p-0.30=1.50
add 0.30 to both sides
3p=1.80
divide both sides by 3
p=0.60

a pencil costs 60 cents

User Potame
by
8.0k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories