Answer:
4
Step-by-step explanation:
you can do
horizontal
diagonal (both ways)
vertical
A * b = 30
a - b = 1
a + b = 11
take ur last 2 equations, and add them
a - b = 1
a + b = 11
--------------add
2a = 12
a = 12/2
a = 6
now its just a matter of subbing
a + b = 11
6 + b = 11
b = 11 - 6
b = 5
so a = 6 and b = 5...whose product is 30, whose difference is 1, and whose sum is 11.
The easy thing to do is eliminate x by subtraction
x + 7y = 24
- x - 9y = -24
-------------------
16y = 48
now solve for y and then substitute the value into either original equation to find x
For the ODE
multiply both sides by <em>t</em> so that the left side can be condensed into the derivative of a product:
Integrate both sides with respect to <em>t</em> :
Divide both sides by 
to solve for <em>y</em> :
Now use the initial condition to solve for <em>C</em> :
So the particular solution to the IVP is
or
