math, help

posted by on .

how do i write the equations so i can solve it i will do the solving but help me out with the equation please.for the following:

Four pencils and five pens cost\$2.00. THree pencils and four pens cost \$1.58. Find the cost fo a pencil and the cost of a pen.

and then also for this one:

Together, a stakeboard and a bicycle cost \$199.00. THe skateboard cost \$51.00 less than the bicycle. How much does each cost.

Ok..Number 1

let P represent the pencils and N represent the pens

So

4P + 5N = 2.00
3P + 4N = 1.58

nUMBER 2

let x represent the cost of the bicycle

so
The equation is

x + x - 51= 199

Hope i helped... link me if u need nemore help

x=pencils
y=pen
==============
4x+5y=2.00
3x+4y=1.48
solve for x and y

S+B=199.00
S=B+51
==============
solve for S and B

For Problem #1
I get
x= 0.20
y = 0.24

for problem #2
I get
s=125
b=74

• math, help - ,

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A store has a special offer on a pack of 12 pencils, 4 pens, and 8 colored markers. The special price is \$12.50 for the pack. What fraction of the tools are pencils?

• math, help - ,

5 pens and pencils cost \$55.00 and 3 pens and 5 pencils cost \$41.00. Find the cost for 4 pens and 3 pencils