The $y-$axis is the vertical number line.

Find the coordinates of the point whose whose abscissa is the solution of the first equation and ordinate is the solution of the second equation.

$3-2x=7;2y+1=10-2\frac{1}{2}y$

Find the coordinates of the point whose whose abscissa is the solution of the first equation and ordinate is the solution of the second equation.

$\frac{2a}{3}-1=\frac{a}{2};\frac{15-4b}{7}=\frac{2b-1}{3}$

Find the coordinates of the point whose whose abscissa is the solution of the first equation and ordinate is the solution of the second equation.

$5x-(5-x)=\frac{1}{2}(3-x);4-3y=\frac{4+y}{3}$

The co-ordinates of three vertices of a rectangle $ABCD$ are given. By plotting the given points; find the co-ordinates of the fourth vertex.

$A\left(2,0\right),B\left(8,0\right) \text{and} C\left(8,4\right)$