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I need help solving some simultaneous equations using the elimination method, here are the questions: 1) y=5x+5, y=-x-19 2) 7x-11y=-13,x+y=11 3)-3x+y=8, 4x+2y=21 4) x-11y=-15, y+6x=9 If you could please show the exact working out and how you came to the answer that would be really great...