Question

X/4 + Y = 12
5X + Y/2 = 45

Answer 1

Explicación paso a paso:

X/4 + Y = 12

X + 4.Y = 48

X = 48 - 4.Y .... ecuacion 1

5.X + Y/2 = 45 .... ecuacion 2

5.(48 - 4.Y) + Y/2 = 45

240 - 20.Y + Y/2 = 45

240 - 45 = 20Y - Y/2

195 = 39.Y/2

195 . (2) = 39.Y

390 = 39.Y

390/39 = Y

10 = Y

Por lo tanto: X = 8