Rewrite the second equation
-2x + 7y = -10.5 Now double it.
-4x + 14y = -21
Now add that to the first of your equations
5y = -2.5
y = -0.5
4x + 4.5 = 18.5
4x = 14
x = 3.5
solve the elimination methods
4x-9y=18.5
7y-2x=-10.5
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