Question 55216
Solve the system by graphing, addition and substitution methods. 
–4x + 7y = –10 ...............1
x – 5y = 9................2
x=9+5y
putting in eqn.1
-4(9+5y)+7y=-10
-36-20y+7y=-10
-13y=-10+36=26
y= -26/13 =-2
x=9+5*(-2)=9-10=-1
x=............0...................1.....................2....etc
y=(x-9)/5....-1.8................-1.6..................-1.4.. etc
Y=(4X-10)/7..-10/7................-6/7.................-2/7...ETC
 {{{ graph( 500, 500, -10, 10, -10, 10,(x-9)/5, (4*x-10)/7) }}}
the 2 graphs intersect at x=-1 and y=-2