first step is usually to get rid of the nasty fractions. I see there's a typo in the first equation. I'll just assume 9/4 x. If wrong, fix it and follow the same steps to solution.
18x + 3y = -18
-4x + 45y = 4
or
6x + y = -6
-4x + 45y = 4
multiply to get rid of x:
12x + 2y = -12
-12x + 135y = 12
Now add the two equations to get
137y = 0
y = 0
so, x = -1
If I made the wrong guess, fix it and follow similar steps to solution.
Solve the system of equations by the elimination method 9/x++3/8y=-9/4 and -1/9x+5/4y=1/9
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