X=y+3 <span>-5x-4y=<span>30 ------------------- Substitute y + 3 for x in </span></span>-5x-4y=30 <span><span>-5<span>(y+3)-</span></span>4y</span>=<span>30 </span>-9y-15=<span>30 </span>---------------------------- Add 15 to each side <span><span>-9y-15</span>+15</span>=<span>30+<span>15 -9y = 45 </span></span>----------------------------------- Divide each side by -9 -9y ÷ -9 = 45 ÷ -9 y = -5 Now we solve for x ==================================================================== Substitute -5 for y in x = y + 3 x=-<span><span>5</span>+<span>3 </span></span>x = -2 ---------------------- (-2,-5) is your answer
