Question

3x + y = 15
X-y=-35
$3x+ y = 15 \\ x - y = - 35$
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Answer 1

3x + y = 15

X-y=-35

Igualación =

Y = 15 - 3x

x + 35 = Y

15-3x = x + 35

-3x - x = 35-15

-4 x = 20

x = 20/ -4

x = -5

Y = 15 - 3. -5

Y = 15 + 15

Y = 30