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Write four solutions for each of the following equations:
(i) \( 2 x+y=7 \)
(ii) \( \pi x+y=9 \)
(iii) \( x=4 y \).
To do:
We have to write four solutions for each of the given equations.
Solution:
(i) Given,
$2x+y=7$
Let us substitute $x=0, 1$ and $y=0, 1$
$x=0$
This implies,
$2(0)+y=7$
$0+y=7$
$y=7$
Therefore, $x, y=0, 7$
$x=1$
This implies,
$2(1)+y=7$
$2+y=7$
$y=7-2$
$y=5$
Therefore, $x, y=1, 5$
$y=0$
This implies,
$2x+(0)=7$
$2x=7$
$x=\frac{7}{2}$
Therefore, $x, y=\frac{7}{2}, 0$
$y=1$
This implies,
$2x+(1)=7$
$2x=7-1$
$2x=6$
$x=\frac{6}{2}$
$x=3$
Therefore, $x, y=3, 1$
Hence, the solutions are $x, y=(0,7), (1, 5), (\frac{7}{2}, 0), (3, 1)$.
(ii) Given,
$\pi x+y=9$
Let us substitute $x= 0, 1, $ and $y=0, 1$ to write four solutions.
$x=0$
This implies,
$\pi x+y=9$
$\pi (0)+y=9$
$0+y=9$
$y=9$
Therefore, $x, y=0, 9$
$x=1$
This implies,
$\pi x+y=9$
$\pi (1)+y=9$
$\pi+y=9$
$y=9-\pi$
Therefore, $x, y=1, 9-\pi$
$y=0$
This implies,
$\pi x+0=9$
$\pi x=9$
$x=\frac{9}{\pi}$
Therefore, $x, y=\frac{9}{\pi}, 0$
$y=1$
This implies,
$\pi x+1=9$
$\pi x=9-1$
$\pi x=8$
$x=\frac{8}{\pi}$
Therefore, $x, y=\frac{8}{\pi}, 1$
Hence, the solutions are $x, y=(0,9), (1, 9-\pi ), (\frac{9}{\pi}, 0), (\frac{8}{\pi}, 1)$.
(iii) Given,
$x=4y$
Let us substitute $x=0, 1$ and $y=0, 1$ to write four solutions.
$x=0$
This implies,
$0=4y$
$y=\frac{0}{4}$
$y=0$
Therefore, $x, y=0, 0$
$x=1$
This implies,
$1=4y$
$\frac{1}{4}=y$
$y=\frac{1}{4}$
Therefore, $x, y=1,\frac{1}{4}$
$y=2$
This implies,
$x=4(2)$
$x=8$
Therefore, $x, y=8, 0$
Let $y=1$
This implies,
$x=4(1)$
$x=4$
Therefore, $x, y=4, 1$
Hence, the solutions are $x, y=(0,0), (1, \frac{1}{4}), (8, 0), (4, 1)$.