bantu ya...poin 25 kalo bener. pakai jalannya

3/4 x - 1/2 y = 4
x + 5/2 y = -1

x + 5/2 y = -1
x = -1 - 5/2 y

3/4 x - 1/2 y = 4
3/4 (-1-5/2 y) - 1/2 y = 4
-3/4 - 15/8 y - 1/2 y = 4
-15/8 y - 1/2 y = 4+ 3/4
-19/8 y = 19/4
y = -2

x = -1 - 5/2 y
x = -1 - (5/2)(-2)
x = -1 + 5
x = 4

5x+3y = 5(4) + 3(-2) = 20-6 = 14