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3 years ago

How do i know when to add or subtract in an angle equation?

Mathematics

1 answer:

madam [21]3 years ago

7 0

Answer:

Step-by-step explanation:

< ABD = <ABC + < CBD

Substitute in what we are given

87 = 9x-1 + 6x+58

Combine like terms

87 = 15x +57

Subtract 57 from each side

87-57 =15x +57-57

30 = 15x

Divide by 15

30/15 =15x/15

2=x

We want to find <ABC

<ABC = 9x-1

= 9*2-1

=18-1

=17

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