Is (1, 2) a solution to this system of equations? 10x + 4y = 18 x + 9y = 19

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

How do you use the elimination method for this question? explain, because i really want to understand!

Acompany manufactures large valves, packed in boxes. a shipment consists of 1500 valves packed in 75 boxes. each box has the outer dimensions 1.2 x 0.8 x 1.6 m and the inner dimensions 1.19 x 0.79 x 1.59 m. the boxes are loaded on a vehicle (truck + trailer). the available capacity in the vehicle combination is 140 m3. each valve has a volume of 0.06 m3. - calculate the load factor on the box level (%). - calculate the load factor on the vehicle level (%). - calculate the overall load factor (%).