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Novay_Z [31]
3 years ago
8

2X plus Y equals 7 3X minus 4Y equals five

Mathematics
1 answer:
Dvinal [7]3 years ago
7 0
\left \{ {{2x+y=7\ \ | *4} \atop {3x-4y=5}} \right. \\\\ \left \{ {{8x+4y=28} \atop {3x-4y=5}} \right. \\+----\\Addition\ method\\\\
11x=33\ \ \ | divide\ by\ 11\\
x=3\\\\y=7-2x\\
y=7-2*3=7-6=1\\\\Solution:\\ \left \{ {{y=1} \atop {x=3}} \right.
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Referring to triangle ABC, find the area of the triangle.
ExtremeBDS [4]

Answer: area of triangle = 13.4 ft  ( after rounding the answer to 3 significance figures)

Step-by-step explanation:

formula for the area of triangle

= S + S + S

= 4.34 + 3.78 + 5.27

= 13.9 ft

= 13.4 ( after rounding off to three significant figures )

           

5 0
3 years ago
What is 50.5% of 80?
MariettaO [177]
The answer to your question is 40.4

3 0
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konstantin123 [22]

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Step-by-step explanation:

4 0
3 years ago
In the figure, AB || CD and mZ2 = 55°.
Travka [436]

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4 0
2 years ago
All the answers please on paper and work
REY [17]
1)
8² + 15² = 17²
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This is true, so the triangle is a right triangle.

2)
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This is false, so the triangle is not a right triangle.

3)
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4)
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7 0
3 years ago
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