Please jawab ya,..pake cara kerjanya

[tex] \frac{3}{4} x - \frac{1}{2} y = 4 [/tex] ........... (persamaan A)
[tex] x + \frac{5}{2} y = -1[/tex] ..................(persamaan B)

persamaan A dikali 5

[tex] \frac{15}{4} x - \frac{5}{2} y = 20 [/tex]
[tex] x + \frac{5}{2} y = -1[/tex]     +
-------------------------------------------------------
[tex] \frac{19}{4} x = 19 [/tex]
x = [tex] 19 : \frac{19}{4} = 19 x \frac{4}{19} = 4 [/tex]