Find the percent decrease.
from $80 to $64 dollars.

20% off

Step-by-step explanation:

If you want to quickly figure this out, simply take the 20%, turn it into a decimal (20.) and move it the two spaces over (.20). Next, multiply the .20 by the $80, (.20 x 80 = 16) The 16 in this equation represents the amount of dollars you will be saving. To check your work, simply add 16 to 64, for a total of 80!

Hope this helps!

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation: