tentukan masing-masing nilai a dan b

Jawaban:

[3×(-5)] + [3×(-8)] = 3×(a+b) = 3×[(-5)+(-8)]

[3x(-5)] + [3x(-8)] = 3x(a+b)
3x(a+b) = -15x + (-24x)
3x(a+b) = -39x
a + b = -39x/3x
a + b = -13

→ a = -13 - b
→ b = -13 - a