What is the value of y in the solution to the system of equations?

x + y = 1

2x – 3y = –30

a. 4/3x=42
b. 0=26
c. 15/2y=33
d. 0=0

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

What expression is equivalent to 42x-56y

Trying to figure out the standard form equation for this graph