Question 258143
The slope formula is
(i) {{{m = (y2-y1)/(x2-x1)}}}
we are given 
m = 3/4 
(x1,y1) = (-2,0) 
(x2,y2) = (5,?)
we can put everything in except y2. From (i) we get
(ii) {{{(3/4) = (y2-0)/(5-(-2))}}}
be careful about your signs.
simplifying (ii) we get
(iii) {{{(3/4) = (Y2/7)}}}
cross multiply to get
(iv) {{{21 = 4Y2}}}
finally dividing, we get
{{{Y2 = 21/4}}}
This is the missing part.