For $7.52, you purchased 8 pens and highlighters from a local bookstore. Each highlighter costs $1.09 and each pen costs $.69. How many pens did you buy?

P=number of pens

h=number of highlighters

p+h=8

1.09h+0.69p=752

p+h=8

minus h from both sides

p=8-h

sub that for p

1.09h+0.69 (8-h) = 7.52

1.09h+5.52-0.69h=7.52

0.4h+5.52=7.52

minus 5.52 from both sides

0.4h=2

divide both sides by 0.4

h=5

sub back

h=8-p

5=8-p

minus 8 frm both sides

-3=-p

mltiply both sides by - 1

3=p

3 pens you bought