we have the equation
y=10x+9
Part 1
Find out the value of y when the value of x=1
so
For x=1
substitute the value of x in the given equation
y=10(1)+9
y=10+9
y=19
Part 2
For x=2
substitute the value of x in the given equation
y=10(2)+9
y=20+9
y=29
Part 3
For x=3
y=10(3)+9
y=30+9
y=39