To find the inverse of a function, simply switch the variables x and y.
So for the function y=7x+3, the inverse would be x=7y+3, or y=(x-3)/7.
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7x + y + 3 = y7x + 3 = 07x = -3x = -3/7
Here's the kind of process you can use to find out:Write the equation, so you can look at it:7x + 2 = 4x - 3Subtract 4x from each side of the equation:3x + 2 = -3Subtract 2 from each side:3x = -5Divide each side by 3:x = - 5/3
7x-3=3x+8 7x-3x=8+3 4x=11 x=11/4=2.75
7x = 3 x = 3/7
5x - 3y -7x + 2y +3x = (5-7+3)x + (-3+2)y = x - y