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solong [7]
3 years ago
15

Solve by elimination 8x+9y=-55 -8x+y=65

Mathematics
2 answers:
algol [13]3 years ago
4 0
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
Eva8 [605]3 years ago
3 0

<span>8x+9y=-55
<u> -8x+y=65</u></span><u>                 </u>(+)

10y=10  /:10

<em>y=1</em>

<em>
</em>

<em />-8x+1=65

-8x=64   /:(-8)

x=-8


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