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anyanavicka [17]

3 years ago

6

How many solutions does the system of equations below have?

1 answer:

levacccp [35]3 years ago

4 0

ok vamos a ver esto y que dos personas lamentaron no haber regresado

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What two numbers add to 9 and multiply to -70

Alborosie

X, y - the numbers

The numbers add to 9 and multiply to -70.
$x+y=9 \\
xy=-70 \\ \\
y=9-x \\
xy=-70 \\ \\
\hbox{substitute 9-x for y in the second equation:} \\
x(9-x)=-70 \\
9x-x^2=-70 \\
-x^2+9x+70=0 \\
-x^2+14x-5x+70=0 \\
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(-x-5)(x-14)=0 \\
-x-5=0 \ \lor \ x-14=0 \\
x=-5 \ \lor \ x=14 \\ \\
y=9-x \\
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The numbers are -5 and 14.

4 0

3 years ago

Subtract 42.5 – 7.32 = _____

denpristay [2]

Step-by-step explanation:

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