It is an equation and the value of y is 18
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273 13+8 = 21 and 13*21 = 273
If 5x plus 3y equals 13, the x equals 2 and y equals 1. This is because 5x2=10 and 3x1=3, and 10+3=13.
It has to be interval notation
1 over 3 plus 1 over 12 equals 5 over 12
a = -4