Question

When x=12, y+15. If x varies directly with y, what is the sum of x and y when y-x=1?

Answer 1

x=ky
when x=12, y=15?

Answer 2

4y=5x

y-x=1
(5/4)x-x=1
(1/4)x=1
x=4
so y =5

so
x+y=5+4=9

Answer 3

i guess you mean when x=12,y=15
12=k*15
k=12/15=4/5

so we have
x=4y/5

what is x+y when y-x=1

well x=4y/5
so we have y-4y/5=1
5y/5-4y/5=1
1y/5=1
y=5

x=4(5)/5=4

x+y=4+5=9

Answer 4

yes, sorry about that. thankyou!