document.write( "Question 701643: What is the value of y if (3, y) is a solution to the equation 5x - 3y = 18? \n" ); document.write( "
Algebra.Com's Answer #432494 by josgarithmetic(39617)![]() ![]() ![]() You can put this solution on YOUR website! If point, (3, y) is a point on the line with the given equation, then the ordered pair must satisfy the equation. Plug in the numbers from the ordered pair.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x=3, y=y (still unknown). \n" ); document.write( "5x-3y=18 \n" ); document.write( "5*3-3*y=18 \n" ); document.write( "15-3*y=18 [substitute the values] \n" ); document.write( "15-15-3y=18-15 [add -15 to both sides] \n" ); document.write( "0-3y=3 \n" ); document.write( "3y=-3 \n" ); document.write( "y=-1. Done.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Check: \n" ); document.write( "5*3-3*(-1)=18? \n" ); document.write( "15+3=18? \n" ); document.write( "18=18, Yes. Done. Checks. \n" ); document.write( " |