What are the solutions to the equation y2 – 1 = 15?
–5 and 5
–4 and 4
–7 and 7
–9 and 9

There is a linear relationship between a salesperson sales and her weekly income.if her sales are $200 her income is $500 and if her sales are 1,200 her income is $600.what is the relationship between sales and income