I'm pretty sure k doesn't have a value it is no solution
Answer:
4
Step-by-step explanation:
-3+4+2+1=4
X=5/9
Y=0.65
See below the following picture for the solution
Answer: 
Step-by-step explanation:
Given
The ratio of mixture of sand and cement is 5:3
If the total volume of mixture is 
Suppose there is 5x and 3x cubic centimeter of sand and cement respectively i.e.

Sand 
So, there is
of sand in the mixture
Y = 3/2x + b
4 = 3/2(-10) + b
4 = -15 + b, b = 19
Y = 3/2x + 19