Question

Tentukan himpunan penyelesain dgn metode eliminasi

Answer 1

X-y = 5      |x2
2x+5y = -4 |x1
__________
2x-2y=10
2x+5y=-4
__________ -
-7y = 14
y=-2

x-y = 5      |x5
2x+5y = -4 |x1
__________
5x-5y = 25
2x+5y = -4 
__________ +
7x = 21
x= 3 

b.
x+y = 3  |x2
2x+3y=7 |x1
___________
2x+2y=6
2x+3y=7
__________ -
-y = -1
y=1

x+y = 3  |x3
2x+3y=7 |x1
___________
3x+3y=9  
2x+3y=7 
___________ -
x = 2