Well, put x=0 then y=4
x=6 y=0
x=3 y=2
Now plot the graph :)
Are you looking for slope?
if u r the slope is -6/3
since this a 45 45 90 right triangle to get the side lengths you divide 2 times the square root of 2 and you get 2, since this has two congruent angles which makes it an Isosceles triangle. your a and b value are 2.
Answer:
let required no be x

by doing crisscrossed multiplication

42=7x
dividing both side by 7

6=x
therefore x=6
therefore value of remaining no.is 6