document.write( "Question 19498: y=2x=4
\n" ); document.write( "x-4y=-7\r
\n" ); document.write( "\n" ); document.write( "solve each linear equations if possible. \n" ); document.write( "

Algebra.Com's Answer #9431 by MelanieBCC(40) $\"\"$ $\"About$

You can put this solution on YOUR website!
On your first equation there are 2 equal signs. I'm going to solve this as if it is $\"y=2x-4\"$ . I'll do this step by step so that you can apply the information if the equation is supposed to be something else.
\n" ); document.write( "There are 2 methods to solve a system of linear equations, substitution and elimination. For this system, substitution is easiest, because we know that y equals 2x-4. Since this information came from the first equation, we use it in the second by substituting all y values in the second equation with 2x-4 to get:
\n" ); document.write( " $\"x-4%282x-4%29=-7\"$ and then solving for x
\n" ); document.write( " $\"x-4%282x-4%29=-7\"$ becomes $\"x-8x-7=-7\"$ which becomes $\"-7x=0\"$ which becomes $\"x=0\"$
\n" ); document.write( "Go back to the first equation and substitute $\"0\"$ for all values of x. This gives you $\"y=2%280%29-4\"$ which becomes $\"y=-4\"$ \r
\n" ); document.write( "\n" ); document.write( "I hope this helps!\r
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