Question 103767
A) x+y=2 
B) y=2x-13
.
A) x=2-y subtract y from each side
B) y=2(2-y)-13 replace x by 2-y.
y=4-2y-13
3y=-9 add 2y to both sides.
y=-3 divide both sides by 3.
.
A) x=2+3 replace y with -3
x=5
.
Ed
{{{graph(500,500,-10,10,-10,10,2-x,2x-13)}}}