5x - 3y = 13
4x - 3y = 11
2007-08-30 18:40:24 · 3 answers · asked by rose c 1 in Science & Mathematics ➔ Mathematics
5x - 3y = 13
- 4x + 3y = - 11---ADD
x = 2
8 - 3y = 11
3y = - 3
y = - 1
x = 2 , y = - 1
2007-08-30 20:25:05 · answer #1 · answered by Como 7 · 1⤊ 0⤋
there are many way to do this, this is one of them
-4(5x - 3y = 13)
5(4x - 3y = 11)
-20x + 12y = -52
20x -15y = 55 .........................add those 2 equation
-20x + 20x + 12y - 15y = -52 + 55
-3y = 3
y = -1
5x - 3y = 13
5x -3(-1) = 13
5x + 3 = 13
5x = 10
x = 2
2007-08-30 20:05:46 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Subtract:
..5x - 3y = 13
-(4x - 3y = 11)
______________
..x ......... = 2
10 -3y = 13
-3y = 3
y = -1
thus x = 2, y = -1.
©
2007-08-30 19:58:02 · answer #3 · answered by Alam Ko Iyan 7 · 0⤊ 1⤋