Question 121692
1.{{{x + y = 13}}}
2.{{{y - x = -7}}}
Use equation 2 to get an expression for y in terms of x.
2.{{{y - x = -7}}}
{{{y = -7 + x}}}
Now substitute that expression into equation 1 and solve for x.
1.{{{x + y = 13}}}
{{{x + (-7+x) = 13}}}
{{{2x-7=13}}}
{{{2x=20}}}
{{{highlight(x=10)}}}
From equation 2,
{{{y = -7 + x}}}
{{{y = -7 + 10}}}
{{{highlight(y = 3)}}}
Check your answers.
1.{{{x + y = 13}}}
{{{10+3=13}}}
{{{13=13}}}
True statement
2.{{{y - x = -7}}}
{{{3-10=-7}}}
{{{-7=-7}}}
Ture statement.
Your answers led to true statements.
They are good answers.