Question

Himpunan penyelesaian dari sistem persamaan x + y = -1 dan 4x + 7y = 5 adalah

Answer 1

X + y = -1 |×4|
4x + 7y = 5 |×1|
-> 4x + 4y = -4
4x + 7y = 5
--------------------- -
-3y = -9
y = 3

x + y = -1
x + (3) = -1
x = -1 - 3
x = -4

maka hp = (-4,3)

smoga membantu

Answer 2

X+y=-1        ×4
4x+7y=5      ×1
----------------
4x+4y=-4
4x+7y=5
-------------- -
-3y = -9
y=3

x+y=-1
x=-1-y
x=-1-3
x=-4

HP : (-4,3)