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MATHEMATICS [2 Mark Question Answer]

Simultaneous (Linear) Equations (Including Problems) · ICSE STD 9 (ICSE - English Medium). 2 questions.

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[2 Mark Question Answer]

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Question 12 Marks
For solving pair of equation $,$ in this exercise use the method of elimination by equating coefficients$:y = 2x - 6; y = 0$
Answer
$y = 2x - 6 ...(1)$
$y = 0 ...(2)$
Adding equation $(1)$ and $(2)$
$2x - y = 6$
$+ y = 0 $
$2x = 6$
$x = 3$
$\therefore x = 3 $ and $y = 0.$
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Question 22 Marks
Find the value of m $,$ if $x = 2, y = 1$ is a solution of the equation $2x + 3y = m.$
Answer
Let $x = 2$ and $y = 1$ be a solution of the equation.
$2x + 3y = m$
$\Rightarrow 2(2) + 3(1) = m$
$\Rightarrow 4 + 3 = m$
$\Rightarrow m = 7$
$\therefore $ If $x = 2$ and $y = 1$ is the solution of the equation
$2x + 3y = m$ then the value of m is $7.$
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[2 Mark Question Answer] - MATHEMATICS STD 9 Questions - Vidyadip