Answer:
y=x-9/3
Step-by-step explanation:
f(x)=3x+9
let f(x)=y
y=3x+9
change position of x & y
x=3y+9
rearrange:
x-9=3y
y=x-9/3
Answer:
15.09
Step-by-step explanation:
Hope this helps!
General formula for area of triangle is 
.
Where:
is height of triangle perpendicular to base side of triangle.
is the length of base side of triangle.
Multiplying and results in rectangle, dividing that by 2 gives you area of a triangle.
Hope this helps.
Sometimes it will, and sometimes it won't.
I reason as follows:
(21 + x) + (30 + 2x) = 51 + 3x has an 'x' term
(42 + x) + (30 - x) = 72 has no 'x' term.
I believe it is 3. since it touches the x-axis in three areas
