Answer:
39
Step-by-step explanation:
Answer:
The correct option is 'c' <em>cross-multiplication</em>
Step-by-step explanation:
7 x² + 7 y² - 28 x + 42 y - 35 = 0 /: 7
x² + y² - 4 x + 6 y - 5 = 0
( x² - 4 x + 4 ) + ( y² + 6 y + 9 ) - 4 - 9 - 5 = 0
The equation in the standard form is:
( x - 2 )² + ( y + 3 )² = 18
The center is at the point ( 2, - 3 ).
Its radius is: √18 = 3√2 units.
<span>x + y = 56
x = 4y
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4y + y = 56
5y = 56
y = 10.4
x = 41.6</span>