Question

Tolong bantu nmr 3a yaa , tentang matriks ?

Answer 1

2x + 3y = -5 (×1)
5x - y = 13 (×3)

2x + 3y = -5
15x - 3y = 39
_____________ + (eliminasi)
17x = 34
x = 2

2x + 3y = -5
2(2) + 3y = -5
3y = -5 - 4
3y = -9
y = -3

(x^2 - y^2)
=(2^2 - (-3)^2)
=(4 - 9)
=-5