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kotegsom [21]
3 years ago
6

Solve the system by substitution. - 2x + 7y = 15 6y = х​

Mathematics
1 answer:
ruslelena [56]3 years ago
7 0
Tuch CG GC bnmkgcc hhdnjxuxjfu yckfk. Icing
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The quadratic equation ax^2+32x+c=0 has exactly one solution. If a+c=130, and a>c, find the ordered pair (a,c).
vitfil [10]
Ie 32^2 - 4ac=0 so ac=256 and a+c=130 
So, that means:2 equations ac=256 a+c=130 ie c=130-a 
So,a(130-a)=256 so 130a -a^2=256 ie a^2-130a +256=0 (a-2)(a-128)=0 
Finally,giving a= 2 or a=128 so, a=2 c=128 or a=128 c=2 
Since, a>c , a=128 and c=2 ie (128,2)
4 0
3 years ago
Use rounding or compatible numbers to estimate the difference 762- 332
Ber [7]
You would round 762 to 800, then you would round 332 to 300. You would take those 2 numbers and put them in the questions and it should look like this:
800-300, then you would subtract
Good luck!
5 0
3 years ago
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A figure is made up of with seven X rodes and five Y rodes . If X= 3 and Y= 5 calculate the perimeter with the formula.
sergey [27]
46? Since we got 7*3+5*5 and that is 21+25=46.
5 0
3 years ago
6 - 1/3x = -1<br> what does x equal<br> please explain the process
NISA [10]
X = -21

Step 1: Subtract 6 from both sides -1/3x = -7
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5 0
2 years ago
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PLEASE HELP ME I SUCK MATH AND THIS IS CONFUSING
evablogger [386]

Answer:

Y = x + 95

y = 42 + 95

y=137 mm Hg




3 0
3 years ago
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