Please can any one solve the simultaneous equation ​

Eliminating c first is easiest:

• adding equations 1 and 2 together gives

(4g + 12f - c) + (10g - 14f + c) = 40 + (-74)

14g - 2f = -34

[7g - f = -17]

• adding equations 1 and 3 together gives

(4g + 12f - c) + (12g + c) = 40 + (-36)

16g + 12f = 4

[4g + 3f = 1]

Multiply the first equation wrapped in [] above by 3, then add it to the other one. This eliminates f :

3 (7g - f ) + (4g + 3f ) = 3 (-17) + 1

(21g - 3f ) + (4g + 3f ) = -51 + 1

25g = -50

Solve for g :

g = -2

Plug this into the first equation in [] and solve for f :

7 (-2) - f = -17

-14 - f = -17

f = 3

Plug these both into any of the original 3 equations. The third one has no f term, so that's simplest. Solve for c :

12 (-2) + c = -36

-24 + c = -36

c = -12

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm