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4. Linear Equations in Two Variables
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નીચેના સમીકરણના ચાર ઉકેલ લખો : $2x + y = 7$
Option A
Option B
Option C
Option D
Solution
જો $x=0$ હોય, તો $2x+y=7$
$\therefore 2(0)+y=7$
$\therefore 0+y=7$
$\therefore y=7$
આમ, $x=0$ હોય, તો $y=7$ $\therefore$ ઉકેલ $(0,\,7)$
જો $x=1$ હોય, તો $2x+y=7$
$\therefore 2(1)+y=7$
$\therefore 2+y=7$
$\therefore y=7-2$
$\therefore y=5$
આમ, $x=1$ હોય, તો $y=5$ $\therefore$ ઉકેલ $(1,\,5)$
જો $x=2$ હોય, તો $2x+y=7$
$\therefore 2(2)+y=7$
$\therefore 4+y=7$
$\therefore y=7-4$
$\therefore y=3$
આમ, $x=2$ હોય, તો $y=3$ $\therefore$ ઉકેલ $(2,\,3)$
જો $x=3$ હોય, તો $2x+y=7$
$\therefore 2(3)+y=7$
$\therefore 6+y=7$
$\therefore y=7-6$
$\therefore y=1$
આમ, $x=1$ હોય, તો $y=1$ $\therefore$ ઉકેલ $(3,\,1)$
Standard 9
Mathematics
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