Mikayla opens a savings account with a principal balance of $3,000. after 5 years, she earns $450 in interest. using the equation i=prt, where i=interest, p= principal, r=rate, and t=time. what is the interest rate on mikayla's account after 5 years?

3% is the interest rate. Using the formula I=PRT, you can simply derive the rate by putting the given numbers in.
I = 450P = 3,000R = ?T = 5 Years
The equation now goes,450 = 3,000 * R * 5450 = 15,000 * R450/15,000 = R0.03 = R
 multiply it by 100,
R = 3%

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!