The pair of equations $2x + y = 6$ and $x + \frac{1}{2}y = 4$ has.........

Subtraction of two numbers is $5$. If the larger number is $x$,then the smaller number is $y = \ldots \ldots \ldots \ldots$

Two lines (coincident) are shown in the following graph. Which option from the following is true for the solution of the pair of linear equations in two variables?

Solve the following pair of equations: $(a \neq 0, b \neq 0)$
$\frac{2}{a} = -1 - \frac{3}{b}$
$\frac{9}{b} = \frac{4}{a} + 7$

If a pair of linear equations is consistent,then the lines will be

In a competitive examination,one mark is awarded for each correct answer while $\frac{1}{2}$ mark is deducted for every wrong answer. Jayanti answered $120$ questions and got $90$ marks. How many questions did she answer correctly?