Y varies inversely as x. If x= -5 then y =10. Find y when x=4

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Pls brainliest will be awarded if answer is correct

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.