Identify the slope and y-intercept of each linear function's equation.
x-3=y
slope = -1; z-intercept at 3
y = 1- ar
slope = -3; 3-intercept at 1
-*+3=y
slope = 1; y-intercept at -3
y = Sr-1
slope = 3; z-intercept at-1

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Step-by-step explanation:

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