What's the answer plz answers

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41