### 12 Answers

- Engr. RonaldLv 71 month ago
3x - 5y = 60 .. eq1

4x + 5y = - 4 .. eq2

---------------------

7x = 56

x = 8 answer//

plug in x = 8 to eq1

3x - 5y = 60

3(8) - 5y = 60

24 - 5y = 60

- 5y = 60 - 24

- 5y = 36

y = - 36/5 answer//

- PhilomelLv 72 months ago
3x-5y=60

4x+5y=- 4

add

7x=56>>>x=8

24-5y=36>>>y= - 36/5

32+5y= - 4

5y= - 4- 32=-36>>y= - 36/5 ok

- 2 months ago
3x - 5y = 60 -------------1

4x + 5y = - 4--------------2

Adding the above equations, we get

7x = 56

or x = 8

Equation 2 is 4x + 5y = - 4

So,

5y = - 4 – 32

y = -7.2

- PuzzlingLv 72 months ago
You can just type this system into WolframAlpha and get the answer.

Or you could do it yourself. Given that you have -5y and 5y, you can add the equations and eliminate y as a variable. That leaves:

7x = 56

x = 56/7

x = 8

Then plug that into either equation to get y.

Answer:

x = 8

y = -36/5 (or -7.2)

- What do you think of the answers? You can sign in to give your opinion on the answer.
- la consoleLv 72 months ago
(1) : 3x - 5y = 60

(2) : 4x + 5y = - 4

You calculate (1) + (2):

(3x - 5y) + (4x + 5y) = 60 + (- 4)

3x - 5y + 4x + 5y = 60 - 4

7x = 56

x = 8

Recall (1):

3x - 5y = 60

24 - 5y = 60

5y = 24 - 60

5y = - 36

y = - 36/5

- az_lenderLv 72 months ago
Add the two equations, you get 7x = 56, so x = 8,

and then 24 - 5y = 60, so 5y = -36 and y = -7.2

- 2 months ago
add two equation 3x-5y+4x+5y=60-4

7x=56

x=56/7

x=8

put the value on equation 1

3*8-5y=60

24-5y=60

-5y=36

y=-36/5