Question 480272: Can you please tell me if i got these correct?
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.
1.) 2x-3y=7 i got y=2/3x-7/3
2.) y=4/3x-10 i got 4x-3y=30
3.) .5x+y=12 i got y=.5x+12
4.) y=1/2x-2/3 i got 3x-6y=4
Solve the linear systems of equations using the elmination or addition/multiplication method.
5.) 9a+2b=10
9a-2b=8 I got a=1 b=1/2
6.) 3x+3y=15
4x-y=10 I got x=3 y=2
7.) 8x-2y=12
7x+3y=15 I got x=162/19 y=66/38
Solve the systems of linear equations using the substitution method.
8.) y=2x+3
2x+3y=10 I got (1/8,13/4)
9.) 5x-y=8
x+y=10 I got (1/2, 19/2)
10.) 12x+2y=7
y=x+5 i got (-3/14, 67/14)
11.) x=y+2
4y=3x-5 I got (-7, -9)
Solve the systems of linear equations using graphing method
12.) y=2x-13
y=-3x+7 I got (4, -5)
13.) 2x+y=10
x+3y=15 I got no solution, parallel lines
14.) 4x+2y=8
y= -2x+6 I got (3,2)
Word problem:
15.) Jill makes a blend of choclates for the bake sale. The dark chocolate is $6.00/ lb., and the milk chocolate is $4.00/ ib. Write an inequality shoing how Jill sells more than $25.00 for chocolate.
I got 6x+4y>25
If you can please tell me which ones I got wrong I would really apperciate it I really need to pass thi test and see if I need to strudy some more.
This would be a big help. Thanks
Found 2 solutions by Edwin McCravy, solver91311:
Answer by Edwin McCravy(20054)   (Show Source):
You can put this solution on YOUR website!
These are wrong:
3.) .5x+y=12 i got y=.5x+12
7.) 8x-2y=12
7x+3y=15 I got x=162/19 y=66/38
9.) 5x-y=8
x+y=10 I got (1/2, 19/2)
11.) x=y+2
4y=3x-5 I got (-7, -9)
13.) 2x+y=10
x+3y=15 I got no solution, parallel lines
14.) 4x+2y=8
y= -2x+6 I got (3,2)
Edwin
Answer by solver91311(24713)  (Show Source):
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