3 years ago

Solve the system of equations below. 5x-2y=18 3x+3y=15

Mathematics

2 answers:

JulsSmile [24]3 years ago

8 0

Answer:

(4,1)

Step-by-step explanation:

Shalnov [3]3 years ago

4 0

$\left\{\begin{array}{ccc}5x-2y=18&|\cdot3\\3x+3y=15&|\cdot2\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}15x-6y=54\\6x+6y=30\end{array}\right}|\text{add both sides of the equations}\\.\qquad21x=84\ \ \ \ |:21\\.\qquad\boxed{x=4}\\\\\text{put the value of x to the second equation}\\\\3(4)+3y=15\\12+3y=15\ \ \ \ |-12\\3y=3\ \ \ \ |:3\\\boxed{y=1}\\\\Answer:\ x=4,\ y=1\to \boxed{B.\ (4,\ 1)}$

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