15x+4y=35
100x-2y=90
100x-2y=90
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100x - 2y = 90
15x + 4y = 35
50x - y = 45
y = (35 - 15x) / 4
y = 50x - 45
(35 - 15x) / 4 = 50x - 45
35 - 15x = 200x - 180
215 = 215x → x = 1
y = 50x - 45 = 50 - 45 = 5 → y = 5