Please help :(( I’ve been stuck on this for like an hour

What’s the domain of this function? fastttt

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.