The sum of two numbers is 11. The larger number is 1 less than twice the smaller number. What are the two numbers?

Which equations can be used to express the problem as a system of two linear equations in slope-intercept form? Select all that apply.
y = one-half x minus 1
y = 2x –1
y = x –11
y = x + 11
y = 11 – x


and what do the points do,this is unrelated, but i have no idea