<span>3a+4x=29 (1st)
2a-3x=-9 (2nd)
multiply (1st) by 3 and (2nd) by 4
</span>9a + 12x = 87 (1st)
8a - 12x = -36 (2nd)
---------------------add
17a = 51
a = 3
<span>2a-3x=-9
</span><span>2(3)-3x=-9
6 - 3x = -9
-3x = -15
x = 5
answer
x = 5 and a = 3</span>
You asked "How do you identify proportional relationships?"
It would be by determining whether two quantities are in a proportional relationship.
A regular octagon centered at the origin can have a few transformations that will yield the same image. Octagons have rotational symmetry of 45 degrees so rotating increments of 45 degrees will move the octagon's image to the pre-image. examples could be rotating 45 degrees and rotating 90 degrees
Half a circle long so you would have gotten 62
