If it's linear, it will follow the format:
y = mx + b
m is the slope, and b is the y intercept.
Hola!
x = 7 , x = -7
Explicación:
Comienza restando 15 en cada lado:

Usted obtiene:

Ahora divide ambos lados por 2:

Usted obtiene:

Como la ecuación está al cuadrado, tendrás que hacer:

que te da: 
Entonces:

Answer:
a.
Step-by-step explanation:
f(x) has the highest or greatest maximum y value of 3
If you recall y=mx+b, the slope-intercept form of a linear equation, the slope, m, is the rate of change of the equation, and the y-intercept is b.
When switching to function notation, we simply swap y for f(x), and if we start at x=0 and graph in the positive x direction, we've started at whatever initial value exists (the y-intercept value).
Simply: F(x) = 2/3 x + 4