For the answer to the question above,
<span>Let x = the length of the first piece </span>
<span>Then 3x = length of the second piece </span>
<span>And 5x + 2 = length of the third piece </span>
<span>Now, add all three of these together and set equal to 47: </span>
<span>x + 3x + (5x + 2) = 47 </span>
<span>Now combine all the like terms and solve for x. Then use that value to find the length of the third piece.</span>
first lets solve for x
9x-7y=-7
it will be easier to start if the equation is equal to 0
so first add 7 on both sides
9x-7y=-7
+7 +7
now we have
9x-7y+7=0
now to get x on one side subtract 9x from both sides
<span> 9x-7y+7=0
</span>-9x -9x
--------------------
-7y+7=-9x
now to get x alone we divide both sides by -9
7/9y-7/9=x
