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Sergeeva-Olga [200]
3 years ago
9

I need help figuring out a way to find x for both

Mathematics
1 answer:
Mariana [72]3 years ago
3 0

Both problems are proportions, so cross multiply in each problem to get rid of the fractions.

41. \dfrac{9}{x} = \dfrac{12}{21}

Reduce the fraction in the right side.

\dfrac{9}{x} = \dfrac{4}{7}

Cross multiply.

4x = 9 \times 7

4x = 63

x = \dfrac{63}{4}

x = 15.75

43. \dfrac{5}{2} = \dfrac{10}{x - 2}

Cross multiply.

5(x - 2) = 2 \times 10

5x - 10 = 20

5x = 30

x = 6

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