Question

if (0, a) is a solution of 2x- 3y= 21 the value of a is
1) 7
2) - 7
3) 4
4) -3

who knows they only answer me who don't know they don't answer me plzzzzzz​

Answer 1

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Question :

✒ If (0,a) is a solution of 2x-3y=21 then the value of a is

Given Equation :

✒ 2x-3y=21

: coordinates=(x,y)=(0,a)

To Find :

✒ The value of a=?

$\large\green{\sf{\underline{\underline{Required \: Answer}}}}$

$\sf \qquad \implies \displaystyle \: 2x - 3y = 21$

$\\ \pink{\qquad \implies \displaystyle \sf \underline{ \: put \: the \: value \: of \: coordinate \: }}$

$\\ \qquad : \implies \displaystyle \sf \: 2(0) - 3(a) = 21$

$\: \\ \qquad : \implies \displaystyle \sf \: 0 - 3a = 21$

$\: \\ \qquad : \implies \displaystyle \sf \: - 3a = 21$

$\: \: \\ \qquad : \implies \displaystyle \sf \: a = \frac{ - 21}{3}$

$\: \qquad : \implies \displaystyle \sf \: a = \cancel{ \frac{ - 21}{3} } = - 7$

$\\ \red{ \qquad : \large\implies \boxed{ \sf{ \underline{the \: answer \: will \: be \: \: a = - 7}}}}$

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Answer 2

Put the point in the equation
We get
2*0-3(a)=21
-3a=21
a=-7