The easiest thing to do to solve all of these is to use the quadratic equation.

The first number (the one attached to x^2) is equal to a. The second number (the one attached to x) is b. The final number (the one with nothing attached) is c.
5x- SR 40= 0., add to the other side, 5x= SR 40. divide both sides by 5, x= SR of 8, or 2 SR 2
Answer:
-16
Step-by-step explanation:
The given linear function is ; 
Let
.
We interchange x and y.
.
We solve for y.
.
We now multiply through by
to get:
.
This simplifies to;
.
Hence
.
The y-intercept is -16
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