Question 900834
{{{x-4y=22}}} --> Equation 1
{{{x=22+4y}}} --> Equation 2 ... Substitute into Equation 3.
{{{2x+5y=-21}}} --> Equation 3
{{{2(22+4y)+5y=-21}}}
{{{(44+8y)+5y=-21}}}
{{{44+8y+5y=-21}}}
{{{44+13y=-21}}}
{{{13y=-21-44}}}
{{{13y=-65}}}
{{{y=-65/13}}}
{{{y=-5}}} ... Substitute into Equation 2.
{{{x=22+4(-5)}}}
{{{x=22-20}}}
{{{x=2}}}
Therefore, x=2 whereby y=-5.