Can you ever us a calculator to determine if a number is rational or irrational? explain

No, you cannot use a calculator. A calculator wil not be able to tell that 0.25 or even 1/3 are a rational number.

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!

Ithink the right answer could be 50%