SOLUTION: Im doing a practice test to study for my real test. I would like to know if i got th questions correct or not. Convert the linear equations to standard or slope-intercept form.

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Question 480296: Im doing a practice test to study for my real test. I would like to know if i got th questions correct or not.
Convert the linear equations to standard or slope-intercept form.
3.) .5x+y=12 i got y=-.5x-12
Solve the linear systems of equations using the elmination or addition/multiplication method.
7.) 8x-2y=12
7x+3y=15 I got x=33/19 y=18/19
Solve the systems of linear equations using the substitution method.
9.) 5x-y=8
x+y=10 I got (3,7)
11.) x=y+2
4y=3x-5 I got (3,1)
Solve the systems of linear equations using graphing method
13.) 2x+y=10
x+3y=15 I got (3,4)
14.) 4x+2y=8
y= -2x+6 I got no solutions parallel lines
If you can tll me which ones are wrong iit would be a bbig help tbhanks
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

3.) .5x+y=12 i got y=-.5x-12..incorrect...should be y=-.5x%2B12...you didn't move 12 to the right side, it was already there and its sign is plus
Solve the linear systems of equations using the elmination or addition/multiplication method.
7.) 8x-2y=12
7x+3y=15 I got x=33%2F19 y=18%2F19....CORRECT
Solve the systems of linear equations using the substitution method.
9.) 5x-y=8
x+y=10 I got (3,7)....CORRECT
11.) x=y+2
4y=3x-5 I got (3,1)....CORRECT
Solve the systems of linear equations using graphing method
13.) 2x+y=10
x+3y=15 I got (3,4)....CORRECT
14.) 4x+2y=8
y= -2x+6 I got no solutions parallel lines....CORRECT