Question

1. x+y=4.X-y = 5;2. 3х-7у=116х+7у=16​

Answer 1

Ответ:

1.1+3=4. 2.10-5=5. 3.3×6-7×1=11

Answer 2

Let's solve the two systems of equations:

1. x + y = 4 ** x - y = 5**

To solve this system, you can use the method of substitution or elimination. I'll use the elimination method. Add the two equations together to eliminate the variable 'y':

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

Simplifying this:

2x = 9

Now, divide both sides by 2:

x = 9 / 2 x = 4.5

Now that we have found the value of 'x,' you can substitute it back into either of the original equations to find the value of 'y.' Let's use the first equation:

x + y = 4.5 + y = 4

Subtract 4.5 from both sides:

y = 4 - 4.5 y = -0.5

So, the solution to the first system of equations is: x = 4.5 y = -0.5

2. 3x - 7y = 11 ** 6x + 7y = 16**

To solve this system, you can use the elimination method. Adding the two equations will eliminate the 'y' variable:

(3x - 7y) + (6x + 7y) = 11 + 16

Simplifying this:

9x = 27

Now, divide both sides by 9:

x = 27 / 9 x = 3

Now that we have found the value of 'x,' you can substitute it back into either of the original equations to find the value of 'y.' Let's use the first equation:

3x - 7y = 3 - 7y = 11

Add 7y to both sides:

-7y = 11 - 3 -7y = 8

Divide both sides by -7 to solve for 'y':

y = -8 / 7

So, the solution to the second system of equations is: x = 3 y = -8/7