Select all the correct answers. which operations can be applied to a matrix in the process of gauss-jordan elimination?

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day