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kap26 [50]
3 years ago
12

Use substitution to solve 1-2. 3x – 3y = 9 x= 7 – 3y

Mathematics
1 answer:
kondaur [170]3 years ago
8 0

Answer:

Solutions are x =4 and y = 1

Step-by-step explanation:

3x-3y =9

In this equation substitute x=7-3y, we get

3(7-3y) -3y=9\\21-9y-3y=9\\-12y= 9-21\\-12y= -12\\y=1

now substitute y =1 in x equation,

x=7-3(1)\\x=7-3\\x=4

Solutions are x =4 and y = 1

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the sum of all but one interior angle of a heptagon is 776°. what is the measure of the final interior angle?
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Answer:

The final interior angle = 124°

Step-by-step explanation:

A heptagon has 7 sides. The sum of the interior angles formula:

The sum of the interior angles =  (n - 2)180 where n = number of sides.

The sum of the interior angles= (7 - 2)180° = 900°

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