Graphs of exponential functions

for both y= 8× and y= (2/7)×, what would be the equation of the horizontal asymptote for those two?

Both graphs approach the x-axis as x gets large either in the positive direction or the negative direction. An equation for the x-axis is  y = 0.

A:
the coefficients are 15 and 100
the variables are x and y
B:
there are two terms
they are 15x and 100y
you know because a term is a single number, single variable, or combined number and variable in an expression
C:
15x shows the total earned from her allowance because the coefficient 15 is in relation to her allowance