Y varies directly with x, and y = 15 when x = 3. What is the value of x when y = 4?
2 answers:
When x = 3 , y = 15 , divide both by 3.
When x= 1 , y = 5. Now multiply both by 4/5
When x = 4/5 , y=4
Y varies directly with x so use
y/x
so when y=15 and x=3
substitute =15/3
when y=4 use y/x again so 4/x (you do not know the x)
15 4
--- * ---
3 x
cross multiply
15x=12
isolate x by dividing 15 on both sides
get x=12/15
You might be interested in
Answer:
C. 2.3 repeated
Step-by-step explanation:
1/3 doesn't equal a (what you could say is) regular decimal. It repeats because it does not evenly go into 10 or 100
Answer:
451.5
Step-by-step explanation:
I'm rusted on the mathematics
Answer:
72
Step-by-step explanation:
substitiute the value of p =8(9)
8x9=72
Answer: 44 Crayons
Step-by-step explanation:
Answer:
6
Step-by-step explanation:
9 x 2/3 = 6