1. (48+k)∙8=4002. (5.4у + 8.3) — 2.1 = 23.13. 86-49:(2x-5)=79

Question

1. (48+k)∙8=400

2. (5.4у + 8.3) — 2.1 = 23.1

3. 86-49:(2x-5)=79

Answer 1

1. 48•8+8k=400
384+8k=400
8k=400-384
8k=16
k=16/8
k=2

3. 86-49:(2x-5)=79
-49:(2x-5)=79-86
-49:(2x-5)=-7
2x-5=7
2x=7+5
2x=12
x=6