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12-06-2018
Mathematics

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5a - 10b =45 when b=3?

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vidalmari6p99qfk vidalmari6p99qfk

12-06-2018

a=15

(-10b = -30)

5a-30=45

5a=75 (45+30)

a=15

75-30 = 45

Answer Link

12-06-2018

Hey there! :)

First, substitute b with 3 and multiply by 10

10 × 3 = 30

Here is the new equation:

5a - 30 = 45

45 + 30 = 75

5a = 75

Divide both by 5

5a ÷ 5 = a
75 ÷ 5 = 15

a = 15

Hope this helps :)

Answer Link

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