El Popocatépetl se encuentra a una altura aproximada de 5550 metros sobre el nivel del mar. Si la presión a nivel del mar es de 101.3 kPa. (Kilopascales). ¿ Cuál es la presión atmosférica en la cima del volcán ? ( La densidad del aire ( ρ ) es igual a 1.29 kg/m3 ), ( 1 kPa = 1000 Pa. = 1000 N/m2 )

D. i think it is the savings

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!