Verified Answer :

  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
eu99li

8x+9y=-55
 -8x+y=65                 (+)

10y=10  /:10

y=1


-8x+1=65

-8x=64   /:(-8)

x=-8


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