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Olenka [21]
3 years ago
11

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

Mathematics
2 answers:
bonufazy [111]3 years ago
6 0
Hey there! :)

<em>First, substitute b with 3 and multiply by 10</em>

10 × 3 = 30

Here is the new equation:

5a - 30 = 45

45 + 30 = 75

5a = 75

<em>Divide both by 5</em>

5a ÷ 5 = a
75 ÷ 5 = 15

a = 15

Hope this helps :)
FromTheMoon [43]3 years ago
3 0

a=15

(-10b = -30)

5a-30=45

5a=75 (45+30)

a=15

75-30 = 45

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