nelly2141
nelly2141
15-03-2017
Mathematics
contestada
Help with this please
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bcalle
bcalle
15-03-2017
The angles are complementary so their angles measures add to 90 degrees.
4y + 7 + 3y - 1 = 90
7y + 6 = 90
subtract 6 from both sides
7y = 84
divide both sides by 7
y = 12
4(12) + 7 = 55 degrees
3(12) -1 = 35 degrees
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doodle10
doodle10
15-03-2017
The diagram shows it is a right angled triangle so you know that:
4y + 7 + 3y - 1 = 90
Which you can simplify to
7y + 6 = 90
And
7y = 84
Therefore if you divide both sides by 7 you get
Y = 12
Answer Link
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