Question

2x+9y=27 X - 3y = -24

Answer 1

I assume that this is a system of equations so I'll use the substitution method.

Make one of the equations equal an isolated variable and since x is already isolated just add -3y on both sides.
x-3y=-24
   +3y   +3y

x=3y-24

Substitute that in for the first equation.

2(3y-24)+9y=27
6y-48+9y=27
15y-48=27
      +48  +48
------------------
15y=75
----- ----
15    15

y=5

Substitute y in the other equation and find x

x-3(5)=-24
x-15=-24
   +15  +15
--------------
x=-9 

<span />