Which quadrilateral always has 4 congruent sides?

Rhombus

Step-by-step explanation:

A rhombus is basically a square that's been turned.

A square has 4 congruent sides, always. So, a rhombus would then also follow this rule.

Rhombus

Step-by-step explanation:

Rhombus has all sides equal in length, and opposite angles equal

i'm going to search it

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