Question

If (a, 4) lies on the graph of 3x + y = 10, then the value of a is

• A. 3
• B. 1
• C. 2
• D. 4

Answer 1

The correct option is C

2

$\because (a,4)$ is the solution of the equation

3x + y = 10

$\therefore x=a,y=4$ will satisfy the equation

$\therefore$ Substituting the value of x and y in the equation

$3\times a+4=10\Rightarrow 3a=10-4=6$

$\Rightarrow a=\frac{6}{3}=2$

$\therefore a=2$