Question 314937
1.{{{4x-5y=20}}} 
2.{{{5x+5y=70}}}
From eq. 2,
{{{5y=70-5x}}}
Substitute this expression into eq. 1,
{{{4x-(70-5x)=20}}}
{{{4x-70+5x=20}}}
{{{9x=90}}}
{{{highlight( x=10)}}}
Then,
{{{5y=70-5x}}}
{{{5y=70-50}}}
{{{5y=20}}}
{{{highlight(y=4)}}}