Question

Please hep!! I need this done by today or I'll fail!!!!!!!!!!!!!!

Answer 1

sure i'll help

Answer 2

Solve the following system of equations by linear combination:

3x + 2y = 7
y = x – 4

Answer 3

the math mans here hes got it covered :)

Answer 4

well the second equation gives you what y is so plug that into the first equation
3x+2(x-4)=7 now solve for x
3x+2x-8=7
combine terms
5x-8=7
add 8
5x=15
divide by 5
x=3
plug that into the second equation
y=3-4
y=-1
solution
(3,-1)

Answer 5

told ya

Answer 6

THANK YOU SO MUCH!

Answer 7

yep

Answer 8

can you help me with a few more?

Answer 9

sure

Answer 10

Solve, using linear combination.

5x + 2y = –4
–3x + 2y = 12

Answer 11

well if we multiply the second equation by -1 and add the equations together we have
8x=-16
divide by 8
x=-2
plug into an equation (it don't matter still get same answer)
-3*-2+2y=12
and solve for y
6+2y=12
2y=6
y=3
answer: (-2,3)

Answer 12

Thanks, i have so much trouble with this :/

How many solutions are there to the following system of equations?

4x – 14y = 6
–2x + 7y = –3


a)0
b)1
c)2
c)infinitely many

Answer 13

well we need to get both equations int y=mx+b form
4x-14y=6
-14y=6-4x
y=(2/7)x-(3/7)
-2x+7y=-3
7y=2x-3
y=(2/7)x-(3/7)
we have exact same line so the answer would be infinitely many

Answer 14

I seriously owe you!!!


Solve this system of equations using any method.

4x – y = 5
3x + y = 16

Answer 15

well we can add the equations together and get
7x=21
divide
x=3
substitute
4*3-y=5
12-y=5
-y=-7
y=7
answer (3,7)

Answer 16

Each small kite costs $4, while each large kite costs $7. If the total money collected selling kites is $150, and 30 kites are sold, which system of equations can be used to find out how many of each size kite are sold?

Let s be the small kites and l be the number of large kites.

Answer 17

Which equation will result if the substitution method is used to solve the following system of linear equations?

x + y = 6
x = y + 2

Answer 18

1. do you just need the system or the amount of kites sold as well
4s+7l=150
s+l=30
2. (y+2)+y=6
2y+2=6
2y=4
y=2
x=2+2
x=4