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Formula
Solve the equation   Graph
$y = 3 x - 40$
$y = - x$
$x$-intercept
$\left ( \dfrac { 40 } { 3 } , 0 \right )$
$y$-intercept
$\left ( 0 , - 40 \right )$
$x$-intercept
$\left ( 0 , 0 \right )$
$y$-intercept
$\left ( 0 , 0 \right )$
$3x-40 = -x$
$x = 10$
 Solve a solution to $x$
$3 x - 40 = \color{#FF6800}{ - } \color{#FF6800}{ x }$
 Move the variable to the left-hand side and change the symbol 
$3 x - 40 \color{#FF6800}{ + } \color{#FF6800}{ x } = 0$
$3 x \color{#FF6800}{ - } \color{#FF6800}{ 40 } + x = 0$
 Move the constant to the right side and change the sign 
$3 x + x = \color{#FF6800}{ 40 }$
$\color{#FF6800}{ 3 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ x } = 40$
 Organize the expression 
$\color{#FF6800}{ 4 } \color{#FF6800}{ x } = 40$
$\color{#FF6800}{ 4 } \color{#FF6800}{ x } = \color{#FF6800}{ 40 }$
 Divide both sides by the same number 
$\color{#FF6800}{ x } = \color{#FF6800}{ 10 }$
 그래프 보기 
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