Elimination method 2x-7y=0 4x+9y=0

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much