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x + y = 4 x 2
4x - 2y = -2 x 1
2x + 2y = 8
$\frac{4x - 2y = -2}{6x = 6}$
x = 1
y = 3
$y - x : \frac{1}{3}y$ = 2:1
105 x 2 = 210
Percentage change = $\frac{105}{105} \times 100$ = 100%
raphael answered the question on January 16, 2017 at 10:12
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