4x-5y=7danx+3y+1=0 tolong dengancara subtitusi

4x-5y=7 |x1| 4x-5y=7
X+3y=0 |x4| 4x+12y=0 dikurangi
=>-17y=7
=>y= -7/ 17
4x-5y=7
4x-5x-7/17=7
4x45/17=7
4x= 7-45/17
.....lanjutkan sendiri