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5x = 20 + y Convert to the form y = mx + b y = 5x - 20 In y = mx + b, m is the slope. I'm sure you can figure it out yourself now.
5x+4y = 20 4y = -5x+20 y = -5/4x+5 Therefore: slope is -5/4 and intercept is 5
The x intercept is the point where y = 0, the y intercept is the point where x =0: For the x intercept: 5x + 2y = 20, but y = 0 => 5x + 0 = 20 => x = 20/5 = 4. So the x intercept is at (4, 0). For the y intercept: 5x + 2y = 20, but x = 0 [The rest of the calculation is left as an exercise for the reader.]
5x = 10 - 20 gives 5x = -10 so that x = -10/5 = -2. Substitute this value in the second equation:-5*-2 + y = 9that is 10 + y = 9so that y = -1
If f(x)=(5x-1)/9 Then the inverse is x=(5y-1)/9 9x=5y-1 9x+1=5y (9x+1)/5=y The inverse is f(x)=(9x+1)/5