$x+y=11 \\
-x=-y-9 \\ \\
\hbox{substitute the second equation by -1} \\ \\
x+y=11 \\
x=y+9 \\ \\
\hbox{substitute y+9 for x in the first equation} \\ \\
y+9+y=11 \\
2y=11-9 \\
2y=2 \\
y=\frac{2}{2} \\
y=1 \\ \\
x=y+9 \\
x=1+9 \\
x=10 \\ \\
(x,y)=(10,1)$

The answer is B.

5 0

2 years ago

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Find the inverse of f(x)=-3x+3

kolezko [41]

To get the inverse, first off do a quick switch on the variables, and then solve for "y".

$\bf f(x)=y=-3x+3\qquad \qquad inverse\implies \boxed{x}=-3\boxed{y}+3
\\\\\\
x-3=-3y\implies \cfrac{x-3}{-3}=y\implies \cfrac{3-x}{3}=y\impliedby f^{-1}(x)$

5 0

3 years ago

Plz help me please

Ainat [17]

The answer would be A) July

5 0

3 years ago

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F(x)=√x-3answersA) √x-3≥0B) x-3≥0C) √x-3≤0D) x-3≤0​

F(x)=√x-3answersA) √x-3≥0B) x-3≥0C) √x-3≤0D) x-3≤0