Which equation represents a horizontal line? A. y= -x B. x= y
C. y= 12 D. x= 12

y=12

Step-by-step explanation:

Equation of Horizontal Line always takes the form of y = k where k is the y-intercept of the line. the horizontal line has the equation y = 12

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.