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a. 5x+y=19|×3 ➡ 15x+3y=57 ➡3x-3y=15
3x-3y=15|×1 3x-3y=15 3(4)-3y=15
________ + 12-3y=15
18x =72 -3y=15-12
x =72/18=4 -3y = 3
y=-3/3