Question 894987
plug in 3 for x and 6 for y
x+8y=7
3+8*6=7
3+48=7
51=7
since 51 doesn't really equal 7 then we know that point (3,6) is not on the line x+8y=7 and is not  a solution for x+8y=7

x+8y=7
3+8y=7
8y=4
y=4/8=1/2 
(3,1/2) is on the line x+8y=7 and is a solution for x+8y=7
x+8y=7
x+8*6=7
x+48=7
x=-41
(-41,6) is on the line x+8y=7 and is a solution for x+8y=7