4) If A = {1,2,3,4} then the relation on AXA where R = {(1,1)(1,2)(2,1)} a) {(x, y): y = 2x) b) {(x, y); x+y=1} c) {(x, y); x+y< 3} d){(x, y); x+y< 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

nswer: a   y-axis

step-by-step explanation: