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1. Add the 2 systems and get 10y = 10. 2. Divide both sides by 10 so you get y = 1. 3. Substitute that in either equation (I'm going to use the 2nd equation). 4. -8x + 1 = 65. 5. Subtract 1 from each side. 6. -8x = 64. 7. Divide by -8 on both sides. 8. x = -8. 9. Check in the other equation. 10. 8(-8) + 9(1) ?= -55 11. -64 + 9 ?= -55 12. -55 = -55
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