Question

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Answer 1

1.
x² - 5xy = 10
x - 5y = 1

x = 1 + 5y

(1 + 5y)² - 5(1 + 5y)y = 10
1 + 10y + 25y² -5(y + 5y²) = 10
25y² + 10y + 1 - 5y - 25y² = 10
5y = 9    /:5
y = 9/5 = 1,8

x = 1 + 5 * 9/5 = 1 + 9
x = 10

{x = 10
{y = 1,8