If $60 is 75% of the original price of a necklace, what is the original price of the necklace?

$80

Step-by-step explanation:

Let the original price be p.  Then,

0.75p = $60, or

p = $60/0.75, or

p = $80

y=-5/9 and x=25/18

Step-by-step explanation:

2x-4y=5

6x-3y=10

Multiple the top by -3

-6x+12y=-15

6x-3y=10

Add both equations

9y=-5

y=-5/9

Plug in y to any equation to find x

6x-3(-5/9)=10

6x+5/3=10

Multiple by 3

18x+5=30

18x=25

x=25/18

Watch out for negative signs