3 years ago

How to solve this problem?

Mathematics

1 answer:

Mrrafil [7]3 years ago

4 0

10.9297 anxdjehsimdudneueneieo

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Solve the system of equations by the substitution method. Then use the solution to evaluate the expression 2x(−3+y).

Slav-nsk [51]

$\left\{\begin{array}{ccc}6x+2y+1=13+10y-x\\5x=y+26-2x\end{array}\right\\\\\left\{\begin{array}{ccc}6x+x+2y-10y=13-1\\5x+2x-26=y\end{array}\right\\\left\{\begin{array}{ccc}7x-8y=12&(**)\\y=7x-26&(*)\end{array}\right\\\\\text{substitute}\ (*)\ \text{to}\ (**)\\\\7x-8(7x-26)=12\\7x-(8)(7x)-(8)(-26)=12\\7x-56x+208=12\\-49x=12-208\\-49x=-196\qquad\text{divide both sides by (-49)}\\\boxed{x=4}\\\\\text{put the value of x to}\ (*)\\\\y=7(4)-26\\y=28-26\\\boxed{y=2}\\\\\boxed{x=4\ and\ y=2}$

$\text{Put the values of x and y to the expression}\ 2x(-3+y):\\\\2(4)(-3+2)=8(-1)=-8\\\\Answer:\ \boxed{\text{The valuie of the expression is -8}}$

3 0

3 years ago

(question is on picture linked)

nalin [4]

here y+13=15

so we got y=2

then y+13+x+12=30

then we will get x=3

7 0

3 years ago

Please answer this question

gladu [14]

Answer:

hope that helped <3

8 0

3 years ago

Read 2 more answers

There are 30 homes in Neighborhood A. Each year, the number of homes increases by 20%. Just down the road, Neighborhood B has 45

disa [49]

Neighborhood A: 30 homes. Each year increases by 20%.
Neighborhood B: 45 homes. Each year increases by 3.

A: 30(1.20)^x
B: 45 + 3x

A: 30(1.20)^5 = 30(2.48832) = 74.6496 or 75 houses
B: 45 + 3(5) = 45 + 15 = 60 houses

6 0

3 years ago

Can i have some help :

Schach [20]

Answer:

b<11=board is shorter then

b>11=more then 11 books

b<12=fewer then 12

b>12=taller then 12

Hope This Helps!!!

8 0

2 years ago