What is the slope of the given line?

slope of given line is -3/4

Step-by-step explanation:

y-intercept(b) = 3

one coordinate is (4,0)

Now,

y=mx+b

or, 0 = m×4+3

or, 0 = 4m+3

or, 4m = -3

so, m = -3/4

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18