The function is given by the formula y = -7x. At what value of x is y equal to 2.8?

To find the value of x at which the given function y = -7x takes on a value of 2.8, it is necessary to substitute 2.8 instead of y in the equation of the function:
2.8 = -7 * x.
Received a linear equation with respect to the variable x. To solve it, it is necessary to divide the left side of 2.8 by the coefficient at x:
x = 2.8 / (-7);
x = -0.4.
Answer: for x = -0.4, the function y = -7x will take on a value equal to 2.8.