the simple intrest earned on $500,000 invested for eighteen months is $90,000 what was the interest rate?​

am comin to you I going to work it

Step-by-step explanation:

You have an equation in two variables, so, strictly speaking, you can't "solve" it.

You can only solve it for either x or y.  

You can make the work easier by dividing all three terms by 2:  4x + 2y = 1.

Here, 2y = -4x + 1, so that y = -2x + 1/2.