Gỉai phương trình sau
Bai 1: Grici ptsau:
a> fax-3y=-5
3x+4y=18
b)₤4x-3y=6
10,4x+0,2y=0
df (x-1) (y+1)=xy+4
{(x+2) (y-1)-xy=-10
eg(x+α) (y-5)=xy-50
00₤3 (x+1)-y=b-dy
25 5+3x+dy
x-2
+1
+ 1 = 3
=3
4+1
31
y+1
a) Job-3y=-15
a>
(3x+4y = 18
6x-gy = 15 (1)
96x +8y = 3.6(2)
Cong (1) US (2): - 17y=-51
y= 3.
Thay y = 3 vao pt (1) tole:
6x-9.3=-15
6x-27 = 75
6 x
= 12
Vây
a
=2.