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Elis [28]
3 years ago
11

Solve using elimination or substitution method

Mathematics
1 answer:
Jlenok [28]3 years ago
6 0

\left\{\begin{array}{ccc}y=\dfrac{2}{3}x+3\\2x-3y=-9\end{array}\right\\\\\text{substitute}\ y=\dfrac{2}{3}x+3\ \text{to the second equation}\\\\2x-3\left(\dfrac{2}{3}x+3\right)=-9\qquad|\text{use distributive property}\\\\2x+(-3)\left(\dfrac{2}{3}x\right)+(-3)(3)=-9\\\\2x-2x-9=-9\qquad|\text{add 9 to both sides}\\\\2x-2x=0\\\\0=0\qquad TRUE\\\\Answer:\ \text{Infinitely many solutions}\\\\\left\{\begin{array}{ccc}x\in\mathbb{R}\\y=\dfrac{3}{2}x+3\end{array}\Rightarrow\left(x,\ \dfrac{2}{3}x+3\right)\right

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**A lot of info is problem-specific.

How to solve:

Since we only need to write the equations, we simply need to find the x and y variables, and the total.

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Problem 2:

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  • Find the x                                                                     2
  • Find the y                                                                     5
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