If the point (a, 7) lies on the graph of the equation 5x - y = 8, then a= -3, 3, 1/5

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Use set buikder notation to represent the following set: {, -2, -1, 0}

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)