Question

Solve the system using elimination.

5x + 4y = 12
3x – 3y = 18

Answer 1

My answer is 2x + y = -6 cause I subtracted the 5 and 3x which gave me 2x. Then i took 4 - 3 which gave me one so it would be just y. then i subtracted 12 - 18 which gave me -6 so if i rewrote it, it would be like this: 2x + y = -6

Answer 2

For the answer to the question above, I'll show my solutions for the answer.
5x + 4y =12
3x - 3y =18
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5x + 4y =12 multiply by 3
3x - 3y =18 multiply by -5
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15x + 12y = 36
-15x+ 15y= -90
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0x + 27y = -54
y=-2
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5x + 4y =12
3x - 3y =18
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5x + 4y =12 multiply by 3
3x - 3y =18 multiply by 4
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15x + 12y = 36
12x - 12y= 72
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27x + 0y = 108
x= 4