Which is the best first step when solving the following system of equations? y= 7x+3 y=9x

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

unless if u could do my questions, if not i wouldn't want to