# How do you solve 2x + 3y = 20 and -4x - 6y = -28 ?

Notice that the left side of the second equation is exactly $\left(- 2\right)$ times the left side of the first equation, so th4e equations are either co-incident or parallel.
The right side of the second equation is not $\left(- 2\right)$ times the right side of the first equation; therefore the equations are parallel.