6x + 45 + 3x = 180
9x - 45 = 180
9x = 135
x = 15
The midpoint between the two points are (0,1/2)
1st option
{(3,0) e (0,9)}; {(2,0) e (0,-4)}; {(1,0) e (0,-5)}
see screenshot
sorry btw, no hablo espanol
It would be 20.4 km because if 1cm is 12km then you just have to multiply 1.7 x 12 = 20.4.