2 years ago

Solve the system using elimination 3x+y=27 -3x+4y=-42

Mathematics

1 answer:

padilas [110]2 years ago

8 0

Hello :)

3x+y=27

-3x+4y= -42

+____________

(3x -3x) + (y+4y) = (27-42)

0 + 5y = -15

y = -3

Put "-3" for "y" in the system:

3x + y =27

3x -3=27

3x = 30

x = 10

Answer = x:10 y: -3

Have a nice day :)

You might be interested in

luz earns $400 for 40 hours of work. use the ratio table to determine how much she earns for 6 hours of work.

olga55 [171]

400
----- = 10 40*10= 400
40

7 0

3 years ago

Read 2 more answers

Pls help me figure this out

hodyreva [135]

Answer:

C. $\frac{27}{225}=\frac{b}{100}$

Step-by-step explanation:

To find the number of black ribbons one would have subtract the amount of red ribbons from the total number of ribbons. Then one would have to express it as a proportion. Part over whole equals percent over 100. The number of black ribbons over total ribbons equals "b" over 100.

8 0

2 years ago

Which property was used to sort the shapes

Burka [1]

Need to see a picture in order to solve it

3 0

2 years ago

Read 2 more answers

Suppose a shipment of 170 electronic components contains 3 defective components. to determine whether the shipment should be ac

lbvjy [14]

If nCk represents the number of ways k parts can be chosen from a pool of n, the probability of interest is the complement of the probability of selecting all good parts.
1 - (167C3)/(170C3) = 42,085/804,440 ≈ 0.0523

_____
nCk = n!/(k!(n-k)!)

7 0

3 years ago

consider the function represented by the equation 16b = 4r - 12. write the equation in function notation, where b is the indepen

katovenus [111]

When you write a function in the form $y=f(x)$ , y is the dependent variable, and x is the independent variable.

So, if b is the independent variable, it means that we have to solve the expression for r.

To do so, we perform the following steps: start with

$16b = 4r - 12$

Add 12 to both sides

$16b+12 = 4r$

Divide both sides by 4:

$4b+3 = r$

So, we wrote the expression in the form $r = f(b) = 4b+3$ , which means that r is the dependent variable and b is the independent variable, as requested.

4 0

2 years ago