<h3>Answer:y = (-0/14261512)+4 = 4 </h3><h3>Step-by-step explanation:[2] y = x + 4</h3><h3 /><h3>// Plug this in for variable y in equation [1]</h3><h3> [1] 12x - 5•(x +4) = -20</h3><h3> [1] 7x = 0</h3><h3>// Solve equation [1] for the variable x </h3><h3 /><h3> [1] 7x = 0 </h3><h3> [1] x = 0 </h3><h3>// By now we know this much :</h3><h3> x = 0</h3><h3> y = x+4</h3><h3>// Use the x value to solve for y </h3><h3> y = (-0/14261512)+4 = 4 </h3><h3>Solution :</h3><h3> {x,y} = {0/14261512,4} </h3>