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Can someone help me on 7-8

Can Someone Help Me On 78 class=

Sagot :

Answer:

7.

∠M=51°

8.∠ABC=125°

Step-by-step explanation:

when we extend one line of a triangle  ,the external angle is equal to the sum of two opposite internal angles.

7.

151-2y=84+6y+3

151-2y=87+6y

151-87=6y+2y

64=8y

y=64/8=8

∠M=6y+3=6×8+3=48+3=51°

8.

20x-15=90+5x

20x-5x=90+15

15x=105

x=105/15=7

∠ABC=20x-15=20×7-15=140-15=125°

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