Listen and write sentences. Use the prompts and the Past Simple and the Past Continuous. 1. While he was watching the football match, his phone rang

 х+у=2
1) -1+3=2     является
2) -8+6=-2  

2х+у=4
1) 2*0,5+3=1+3=4     является
2) 2*(-3)+2=-4