diketahui x=5-y 2x+3y =7 tentukanlah hp dgn cara sibtitusi

diket = x=5-y
dan 2x+3y=7
jawab :
2x+3y=7
2(5-y)+3y=7
10-2y+3y=7
10+y=7
y=-3

x=5-y >> x + y = 5


x + y = 5
2x + 3y = 7
----------------
2x + 2y = 10
2x + 3y = 7
> y = -3
> x = 8