3 years ago

Solve for x? 2x + y = 7 x - y = 5

Mathematics

2 answers:

kupik [55]3 years ago

4 0

Given 2x+y=7...1
x-y=5...2
put x=5+y in 1
2(5+y)+y=7
10+2y+y=7
3y=-3
y=-1
x=5+y
=5-1
=4

Vaselesa [24]3 years ago

3 0

X=4 because the y cancel out and all your left with is 3x=12 the you divide by 3 and get 4

You might be interested in

F(x) = 2x^2<br> Find f(-6)

katrin2010 [14]

Answer:

f(-6) = 72

Step-by-step explanation:

Input -6 for x :

2(-6)²

Complete with P.E.M.D.A.S :

2(36)

then :

so therefore :

f(-6) = 72

f of x equals 72

7 0

3 years ago

• Write an expression for the perimeter of a

Ksenya-84 [330]

Answer:

10 (X+1)

Step-by-step explanation:

Length = 2x + 5

Width = 3x

Perimeter of rectangle= 2(L + W)

P= $2\times (2x+5+3x)$

P= $2\times (5x+ 5)$

Now, taking 5 as common

P= $2\times 5 (x + 1)$

∴ Perimeter of rectangle= $10\times (x+1)$

6 0

3 years ago

Pls help me with this ASAP

Sladkaya [172]

The answer is the first option, 3/1

6 0

3 years ago

Mike had a jar of nickels that had five more nickels than he originally thought. If the total amount of nickels was $4.35, how m

aivan3 [116]

A nickel is worth 5 cents. So if he has 5 nickels extra. They are worth 25 cents. Subtract 0.25 from 4.35 and you get 4.10. Now all you have to do is divide 4.10 by 0.05, which is a nickel. The answer is "Mike thought he had 82 nickels"

3 0

3 years ago

Read 2 more answers

Identify the vertex of the quadratic function in standard form y=2x^2 -16x+31

lapo4ka [179]

Answer:

(4,1)

Step-by-step explanation:

The vertex of the quadratic can be found using -b/2a. The vertex is the point (-b/2a, f(-b/2a)).

To find the x coordinate of the quadratic, define its a,b, and c. The quadratic has a = 2, b=-16, and c=31. Then -b/2a is -(-16)/2(2) = 16/4 = 4.

To find the y-coordinate, input the x=4 and solve for y.

$y=2(4)^2-16(4)+31\\y=2(16)-64+31\\y=32-64+31\\y=1$

The vertex is (4,1).

8 0

3 years ago