How has math been used in the current global pandemic​

Given the graph below state whether or not the relation is a function, and give the domain and range.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

The points (1, 7) and (0, 2) fall on a particular line. what is its equation in slope-intercept form?