Question

In the following exercises, solve the systems of equations by substitution. $\left\{\begin{array}{l}x-3 y=-9 \\ 2 x+5 y=4\end{array}\right.$

   In the following exercises, solve the systems of equations by substitution.
$\left\{\begin{array}{l}x-3 y=-9 \\ 2 x+5 y=4\end{array}\right.$
Intermediate Algebra
Intermediate Algebra
Lynn Marecek 1st Edition
Chapter 4, Problem 33 ↓
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In the following exercises, solve the systems of equations by substitution. $\left\{\begin{array}{l}x-3 y=-9 \\ 2 x+5 y=4\end{array}\right.$
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Transcript

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00:01 Alrighty, so if i want to solve this system of equations using the substitution method, let me write that down here.
00:12 I want to create a situation in which i can substitute one equation in for the other.
00:19 So i want to isolate a variable.
00:22 And so i've got four variables here.
00:24 I have two xs and two ys.
00:26 And if i can choose one, i would choose the variable that does not have a coefficient in front of it, such as the x.
00:33 So let me take my equation here, x minus 3y equals negative 9, and let me add 3y to both sides...
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