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2 years ago

Solve the following proportion by cross multiplying: x / 8 = 28 / 32

2 answers:

6 0

Since it is an equality that means the left side of the equation (x/8) has to be equal to the right side of the equation (28/32). One way you can solve for x is to isolate it. Since it’s an equality like we said you have to do to the left side the same that you would do to the right side to isolate x. So if I multiply by 8 on the left I need to also multiply by 8 on the right. So 8* (x/8) becomes just x since 8x/8 becomes 8/8 * x which is 1 *x. On the right side we do 8 *(28/32) which becomes 28 * 8/32 which becomes 7. So x = 7.

vova2212 [387]2 years ago

4 0

Answer: x = 7

Step-by-step explanation:

$\frac{x}{8} =\frac{28}{32}$

We cross multiply, and we get:

32x = 8(28)

32x = 224

x = 7

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2 years ago

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Representemos el primer enunciado de manera algebraica:

$5x+10y+25z =950$ (1)

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x es el numero de monedas de 5
y es el numero de monedas de 10
z es el numero de monedas de 25

Ahora, el número de monedas de 10 centavos era el triple de las de 25 centavos y que las de 5 centavos era el doble de las de 10 centavos, se puede representar como:

$y=3z$ (2)