The cost of five pencils and one pen is 2.50$, and the cost of one pencil and two pens is 1.85$. what is the cost of two pencils and one pen?

5.50

Step-by-step explanation:

make two equations:

and

we can multiply the top equation by -2

-2x   - 2y  = 5.00

 2x  + 3y  = 5.50

+

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We can plug y into the first to get

add them up to get  5.50

Hope this helps :)

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w