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SVETLANKA909090 [29]
4 years ago
12

5a – 10b = 45, when b = 3?

Mathematics
2 answers:
larisa [96]4 years ago
8 0

If b = 3, and 5a - 10b = 45. Then "a" must be......

Okay, so let's plug in what we know:  5a - 10 x 3 = 45   or    5a - 30 = 45

We now know that 5a = 30 + 45  or  5a = 75

Then, divide:  75 / 5 = 15

a = 15!

KonstantinChe [14]4 years ago
5 0

5a - 10 * 3 = 45

5a - 30 = 45

5a = 75

a = 75 : 5

a = 15

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