What is 12.9 rounded to 1 decimal place

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Factor k2 - 17k + 16. a.(k - 2)(k - 8) b.(k - 1)(k + 16) c.(k - 1)(k - 16)

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)