5a – 10b = 45, when b = 3
2 answers:
5a - 10b = 45 when b = 3, then
5a - (10*3) =45
5a - 30 = 45
5a = 45+ 30
5a = 75
a = 75/5
a =15
Well, since you have the value of b, the first thing you want to do is substitute that value in for b.
5a - 10(3) = 45
10*3 = 30
5a - 30 = 45
Now, to get the variable by itself (a) you have to + 30 because you have to reverse the subtraction.
5a = 75
Now, you divide by 5 to finish getting a by itself.
a = 15
Hope this helps!
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