How do you solve by substitution $x + y = 4$ and $y = 2x + 1$ ?

1 Answer

Jun 8, 2015

${x+y=4$
${y=2x+1$
Take the second and substitute into the first for $y$ :
$x+(2x+1)=4$
$3x=3$
$x=1$
Back into equation 2:
$y=2+1=3$
Solution:
$x=1$
$y=3$

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How do you solve by substitution $x + y = 4$ and $y = 2x + 1$ ?

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Humanities

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How do you solve by substitution x + y = 4x + y = 4 and y = 2x + 1 y = 2x + 1 ?

1 Answer

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How do you solve by substitution $x + y = 4$ and $y = 2x + 1$ ?