Mathematics
10.02.2021 19:33
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Answer and explanation please

Answer and explanation please
Answer and explanation please
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cinderalla16dh
cinderalla16dh
5,0(5 marks)

x=17, y=12

Step-by-step explanation:

From the figure we know that,

Angle CDB = 4x-5

Angle BDE = 10y-3

Angle DEA= 97-2x

Though we are NOT given that line segments BD and AE are parallel, we may assume so by the construction of the triangle.

Hence, BD II AE and are cut by the transversal CE,

Hence,

Angle CDB = Angle CEA Β {Corresponding angles are equal}

4x-5=97-2x\\4x+2x=97+5\\6x=102\\x=17\\\\So,\\Angle\ CDB\ = (4x-5) = (4*17-5) = (68-5) = 63

As we observe that,

Angle CDB and Angle BDE form a linear pair, they are supplementary.

Hence,

Angle CDB + Angle BDE = 180

Thus,\ 63+ Angle\ BDE=180\\Angle\ BDE\ = 180-63=117\\\\As\ BDE=(10y-3),\\117=10y-3\\117+3=10y\\120=10y\\y=12

angellight4all
angellight4all
4,4(18 marks)
X - Phones.
Y - Phone accessories. $ = 10x + 4y.

If she sold 7 phones, she would have to sell 14 accessories. 126 = 10(7) + 4(14). 70 + 56 = 126.

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