Question

3),4)!помогите решить

Answer 1

2.4(c-3d)=2.4c-7.2d
1.3(2c-d)=2.6c-1.3d
2.4c-7.2d-(2.6c-1.3d)=2.4c-7.2d-2.6c+1.3d
2.4c-2.6с= -0.2с
-7.2d+1.3d= -5.9d
ответ;-0.2с; -5.9d