Question

Show graphically that the system of equations 2x + 3y = 10, 4x + 6y = 12 has no solution

Answer 1

The given equations are

`2x + 3y = 10 ⇒ y = \frac { 10-2x }{ 3 }`

x	-4	2
y	6	2
Points	A	B

`4x + 6y = 12     ⇒      y =   \frac { 12-4x }{ 6 }`

x	-3	3
y	4	0
Points	C	D

Plot the points A (–4, 6), B(2, 2) and join them to form a line AB. Similarly, plot the points C(–3, 4), D(3, 0) and join them to get a line CD

Clearly, the graphs of the given equations are parallel lines. As they have no common point, there is no common solution. Hence, the given system of equations has no solution.