Concept:Use substitution from the linear equation to solve the simultaneous equations step by step.Explanation:Given:<br>−2x−5y=3<br><br>x+3y=0<br>From the second equation:<br>x=−3y<br>Substitute x=−3y into the first equation:<br>−2(−3y)−5y=3<br><br>6y−5y=3<br><br>y=3<br>Now substitute back to find x:<br>x=−3(3)=−9<br>Answer:x=−9 and y=3.