2.5
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2.5
2 Numbers are a and b. We have( a>b) a+b=40(1) and a-b=10(2) a=10+b( from 2. Subtracts both side by b) => 10+b+b=40 (from 1. Substitute a with 10+b) => 10+2b =40 => 2b =30 => b =15 =>a=10+15=25 => a=25 b=15.
35
-6b =15 -6b/-6 = 15/-6 b = -2.5
Oh, dude, it's like super simple. So, you could write 15-b as 15 minus b or as b subtracted from 15. It's like basic algebra, you know?