USE THE ADDITION METHOD TO SOLVE THIS

18X + .27Y = .09

.06X - .54Y = -.04

I will assume that the "18" is supposed to be ".18". First, multiply both equations by 100 to get rid of all the decimals:

100[.18X + .27Y] = 100[.09]

18x + 27y = 9

100[.06X - .54Y] = 100[-.04]

6x - 54y = -4

So now it looks like this:

18x + 27y = 9

6x - 54y = -4

Multiply the top equation by 2 and add the two equations together. Y will be gone, and you'll be left with one equation with x in it.

Solve for x, then solve for y by plugging x back into one of the equations.

USE THE SUBSTITUTION METHOD TO SOLVE THIS

X + 6Y =2

5X - 20Y = 5

Rearrange the top equation to solve for either x or y. To solve for x it would be

x = 2 - 6y

Then substitute that in place of x in the second equation:

5(2 - 6y) = 5

You should be able to handle it from here.

Next time, please show some work.