Question

Вычислите 5x+7y если x=-4/7 y=3/5

Answer 1

Простой подставляем и получаем обычный пример. Сначала умножение потом сложение

Answer 2

5х+7у;

5×(-4/7)+7×3/5

-20/7+21/5 = 47/35 = 1 12/35 = 1,34286

Answer 3

To find the value of 5x + 7y when x = -4/7 and y = 3/5, we simply substitute the given values into the expression:

5x + 7y = 5 * (-4/7) + 7 * (3/5)

Now, let's calculate it step by step:

5 * (-4/7) = -20/7

7 * (3/5) = 21/5

Now, we add the two results together:

-20/7 + 21/5

To add fractions with different denominators, we need to find a common denominator. The common denominator for 7 and 5 is 35.

Now, let's convert both fractions to have a denominator of 35:

-20/7 * 5/5 = -100/35

21/5 * 7/7 = 147/35

Now, we can add the fractions:

-100/35 + 147/35 = 47/35

So, the final result is:

5x + 7y = 47/35

We can simplify the fraction further:

47/35 = 1 12/35

Therefore, 5x + 7y = 1 12/35.