Math Help

Archive for June, 2006

Question: ged math test??????????????????

is it hard?????????????????were can i study never understand math allways failed test in school help =*(

Answer: im in the same boat…im taking my math test monday,last test i need.

Math Skills & Equations : Passing the GED Math Test

Question: Need Help With Math Homework. Explanation and answers please. (method of substitution)?

Use the method of substitution to determine the point of intersection for each system of linear equations.

12. {y = -2x + 4
{x = y + 5

13. {2x + 3y = 14
{y = 5x – 1

14. {y = -4x + 9
{6x + y = 10

15. {2x – 0.8y = 0
{-2.5x + 0.2y = 4

Can I please get answers and explanations?

Answer: explanation:
take the first equation, solve for x.
take the result and substitute it for x in the second equation. solve for y.
take the first result and substitute the x value and solve for y.

12.
x = (4-y) / 2
(4-y)/2 = y + 5 gives y = -2
x = (4-(-2))/2 gives x = 3

13.
x = 1
y = 4

14.
x = 0.5
y = 7

15.
x = -2
y = -5

Prentice Hall Algebra 2 – Math Homework Help – YourTeacher.com

Question: percent of change?

i need help with my math homework on percent of change
i have 7 problems and it looks like this

Plz don’t just give me the answer teach me and if posibly show me how you did it like showing the work

before :28 pencils
after :45 pecils

old :6 feet
new :14 feet

regular price :$24.50
sale price :$18.50

may rain :4.8 inches
june rain :3.4 inches

lab1 :6.3 minutes
lab2 :4.5 minutes

ch.6 test:14
ch.7 test:18

2006:1500 students
2007:1200 students

Answer: Divide outcome by starting value, then multiple by 100 (for percentage) . To get the percentage change, subtract 100 to get the change.

so if you had 50 pencils and after class had 40

40/50 * 100 = 80
so you had 80% of your starting pencils

the change would be 80 – 100 = – 20, so a 20% loss of pencils

if breeding cows and last year u had 40, but this year had 50

50/40 * 100 = 125
change would be 125 – 100 = 25
so an increase of 25% in the number of cows from last year.

HTH

Percent to Fraction – YourTeacher.com – Math Help