Himpunan penyelesaian spl dari 2x + 3y = -15 X - 4y = 31

2x+3y=-15 (1)
x-4y=31 (2)

2x+3y=-15
2x-8y=62 (-)
11y=-77
y=-7
x = 2x+3y =-15
2x+3(-7) = -15
2x= -15 + 21
2x = 6
x= 3

HP= {x,y}
= {3,-7}