It would be the second graph
The high temperature was 35 degrees warmer than the low temperature.
If I was solving this, which I suppose I am, my first step would be the clear the fractions by multiplying both sides by <em>a</em>.
That's there, first choice, SELECT IT
Then I'd bring the 5 to the other side;
Not among the choices.
Then I'd attempt to factor, looking for a pair that multiplies to 5 and adds to 8; no joy there.
Shakespeare Quadratic Formula (2b or -2b) trick:
All the other choices have nice rational answers so can't be right.
First choice only
The slope is -2/3 or -2 over 3
Multiplicity is hoa many times it repeats
example
if you have roots, r1 multiplicity 2 and r2 multiliicty 3 the factors are
f(x)=(x-r1)^2(x-r2)^3
so
multiplicty 2 at x=4
multilicty 1 at x=-2
(x-4)^2(x-(-2))^1=
(x-4)^2(x+2))
expand
x^3-6x^2+32
remember
for roots, r1 and r2
(x-r1)(x-r2)
the roots don't change if you multiply whold thing by a unless a=0
so
the yint is where x=0
so the yint now is 32
32 times what=-9.6?
divide both sides by 32
what=-0.3
the polynomial is
p(x)=-0.3(x-4)²(x+2)
expanded is
p(x)=-0.3x³+1.8x²-9.6