What is "if f(x) = 7 + 4x and?

If f(x) = 7 + 4x, it means that the function f takes an input x and gives an output which is equal to 7 plus 4 times the value of x.

This is a linear function with a slope of 4 and a y-intercept of 7. The general equation for a linear function is y = mx + b, where m is the slope and b is the y-intercept. In this case, m = 4 and b = 7, so the function can be written as f(x) = 4x + 7.

This function will produce a straight line when graphed on a Cartesian plane. The slope of 4 means that as x increases by 1, the value of f(x) will increase by 4. The y-intercept of 7 means that the line will intersect the y-axis at the point (0, 7).

Overall, f(x) = 7 + 4x is a simple linear function that can be used to model relationships between variables in many different contexts.