Find an order pair (x, y) that is a solution to -x+3y=9

And explain how you got it so i can understand future problems : 3

Which statements about these triangles is true

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?