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miss Akunina [59]
3 years ago
7

How do I solve for x?

Mathematics
2 answers:
ASHA 777 [7]3 years ago
8 0
The vertical angle diagonally across the equation, (3x +9) is also (3x+9).

Since m is perpendicular to n, that means that (3x + 9) + (x + 21) = 90° This is so because perpendicular lines form right angles which have the measure of 90°

3x + 9 + x + 21 = 90

4x + 30 = 90

4x = 60

x = 15
arlik [135]3 years ago
6 0
3x + 9= x +21
2x + 9 = 21
2x = 30
X = 30
~
2
X = 15
*sorry I don't have the division sign so I used ~
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