Comparing the equation $y = -3$ with the standard form $ax + by + c = 0$,we get $a = \dots$

Graphically,the pair of equations $6x - 3y + 10 = 0$ and $2x - y + 9 = 0$ represents two lines which are:

Solve the following pair of linear equations in two variables using a graph: $x + y = 5$ and $5x - 2y = 4$.

Which of the following pairs of linear equations are consistent/inconsistent? If consistent,obtain the solution graphically: $2x + y - 6 = 0, 4x - 2y - 4 = 0$.

Solve the following pair of linear equations using a graph: $x+y=7$,$5x+2y=20$.

$6$ students of class $X$ took part in the Ramanujan Competitive Examination. The number of girl participants is $2$ less than the number of boy participants. Find the number of girls and the number of boys who took part in the examination using a graph.