tentukan nilaina dan b

Berdasarkan posisi matriks pada gambar:
2a + 3 = 5
5a - b = 10

2a + 3 = 5
2a = 5 - 3
2a = 2
a = 2 ÷ 2
a = 1

5a - b = 10
5(1) - b = 10
5 - b = 10
-b = 10 - 5
-b = 5
b = -5