40 POINTS: 3 QUESTIONS: SIMPLE
Consider the system of equations:
\begin{align*}
5x - 2y &= 16, \\
15x - 7y &= 51.
\end{align*}
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2'nd question:
Solve for $x$ in terms of $y$ if
\[4x + 2y = 7.\]
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Final question:
Find the ordered pair $(x,y)$ that satisfies the system of equations
\begin{align*}
x+y&=15,\\
x-y&=3.
\end{align*}
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Answers
Answered by
1
Step-by-step explanation:
5x-2y=16
15x-7y=51
on multiply eq.1 by 3 we get
3(5x-2y=16)
15x-6y=48
on subtracting both eq.
15x-7y-(15x-6y)=51-48
15x-7y-15x+6y=3
-y=3
y=-3
on puting value of y=-3 in eq.
5x-2y=16
5x-2(-3)=16
5x+6=16
5x=10
x=2
hence x=2 and y=-3
....666....
Answered by
17
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