document.write( "Question 370217: How do i solve 7x + 2y = -8
\n" ); document.write( " 8y = 4x \n" ); document.write( "

Algebra.Com's Answer #263863 by ichudov(507) $\"\"$ $\"About$

You can put this solution on YOUR website!
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Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
\n" ); document.write( " $\"+system%28+%0D%0A++++-4%5Cx+%2B+8%5Cy+=+0%2C%0D%0A++++7%5Cx+%2B+2%5Cy+=+-8+%29%0D%0A++\"$ We'll use substitution. After moving 8*y to the right, we get:
\n" ); document.write( " $\"-4%2Ax+=+0+-+8%2Ay\"$ , or $\"x+=+0%2F-4+-+8%2Ay%2F-4\"$ . Substitute that
\n" ); document.write( " into another equation:
\n" ); document.write( " $\"7%2A%280%2F-4+-+8%2Ay%2F-4%29+%2B+2%5Cy+=+-8\"$ and simplify: So, we know that y=-0.5. Since $\"x+=+0%2F-4+-+8%2Ay%2F-4\"$ , x=-1.
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\n" ); document.write( " Answer: $\"system%28+x=-1%2C+y=-0.5+%29\"$ .
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