Solve the system of equations 2x-y=1; x+2y=8 graphically and find the coordinates of the points where corresponding lines intersect y-axis.
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Calculate the imaginary number $i^k$
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$1$
It is $i^4=1$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 4 } }$
$i ^ { 4 } $ is calculated with exponent divided $ $
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 2 } }$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 2 } }$
$ $ Calculate $ i ^ { 2 + 2 }$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } }$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } } i ^ { 2 }$
$ $ It is $ i^2 = -1$
$\color{#FF6800}{ - } \color{#FF6800}{ 1 } i ^ { 2 }$
$- 1 \color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } }$
$ $ It is $ i^2 = -1$
$- 1 \times \left ( \color{#FF6800}{ - } \color{#FF6800}{ 1 } \right )$
$\color{#FF6800}{ - } 1 \times \left ( \color{#FF6800}{ - } 1 \right )$
$ $ Since negative numbers are multiplied by an even number, remove the (-) sign $ $
$1 \times 1$
$\color{#FF6800}{ 1 } \color{#FF6800}{ \times } \color{#FF6800}{ 1 }$
$ $ Multiplying any number by 1 does not change the value $ $
$1$
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