x+2y=7 6x-2y=7 x = 7 -2y from the first equation Substitute into the second equation 6(7-2y) -2y = 7 solve for y. then solve for x

x+2y=7 6x-2y=7 x = 7 -2y from the first equation Substitute into the second equation 6(7-2y) -2y = 7 solve for y. then solve for x

Find the probability (answer)

A bag of marbles has 3 red, 7 blue, and 2 green marbles in it. Find the probability of blindly drawing out each of the following: A red marble: A blue marble: a green or red marble total marbles = 12 so 3 of the 12 are red, and so on...That is the probability. 3/12...

Balance Sheet (answer)

Decide which ones are assets and add them up. Decide which ones are liabilities and add them up. Anything they owe is a liability. Anything they own already is an asset. For example, the mortgage would be a liability but the business equipment would be an asset.

Math Word problem (answer)

Perimeter = Length + Length + Width + Width = 326 Length = Width + 3 Substitute: Width +3 + Width + 3 + Width + Width = 326 4* Width = 326 - 6 Width = 80 So Length = 83

a tv collector can buy either 2 tv's and 3 dvd players for $1750 or 4 tv's an 1 dvd for $1250 (answer)

2tv + 3dvd = 1750 4tv + 1dvd = 1250 You can use these two equations to calculate the value of a tv. Then you can calculate the value of a dvd by substitution

Is 416 proportional to 52 explain (answer)

416 is exactly eight times greater than 52.

H = 25 to 71 inches tall, H/7 = 0, which means 28, 35, 42, 49, 56, 63,or 70 so H = 7y where y must also be = 2 + 6x H = 2 + 6x = one of the above. 56 = 2 + 6 times 9, I think someone can show you a better way but his gives you a hint....

2x + 3y = 21 x - y = 3 x = 3 + y substitute for x so 2(3+y) + 3y = 21 6 + 2y +3y = 21 you can calculate y and then from that, x

The two key questions are how many marbles in total are there and how many green marbles are there? The answers are 36 and 6. From those, you can calculate the probability.

The equation for slope is y = Mx + b. M is slope and b is the Y intercept where x = 0, which you are given already

Travel in miles (answer)

120/3 = 40 miles per hour one hour is 60 minutes 40 miles in 60 minutes From that you can calculate how many miles in 75 minutes: 40/x = 60/75

length = Width + 2 (length + width) times 2 = 32 simplify to length + width = 16 Substitute (width + 2) for length and you have it. Once you know width, you can calculate length from step one.

what is the range of 2x^2-4x-7 (answer)

I suggest graphing a few points to see what this looks like. That gives you the answer. The below might help you see the answer. For x =0, fx = -7 For x = 1, fx = -9 For x = -1, fx =-1 for x = 2, fx = -7 for x = -2, fx = 9 for...

Math Question (answer)

16 have glasses, brown hair, or both. 7 have glasses which means 9 of the 16 do not have glasses. 14 have brown hair, which means 2 of the 16 do not have brown hair. The most that could have brown hair and glasses is 7 since only 7 have glasses. If the two who do not have...

big O complexity (answer)

We need more information to answer this, more details of the problem, O, etc. There is not enough context to answer which is why no one has answered.

Plane B goes X mph Plane A goes X + 140 mph 4095/X = Plane B hours 4095/(X+140) = Plane A hours Plane B hours = Plane A hours + 4 4095/X = 4095/(X+140) + 4 You should be able to calculate the answer...

V = 225 New V each week = V - .75*V So for week 1, New V = .25*V = .25(225) = 56.25 Then for week 2, V = .25 * 56.25 and so on You could plug this into an Excel spreadsheet formula and cascade down a column and then plot this from the results. ...

Jen takes x minutes Pat = x - 13 minutes x+X-13 = 42 Solve for X

P **2 - (582+4P) = 90 P**2 - 4P - 672 = 0 Solve for P

A = 23 = L times W W = 2L - 6 23 = L * (2L - 6) 0 = 2L **2 - 6L - 23 Here is a related answer from last year: The width of a rectangle is 6 less than twice its length. If the area of the rectangle is 102 square centimeters, what...