Question

X+y=7 ,x-2y=4 (X) (y)

Answer 1

Ответ:

х+у=7. х+2у=4

у=1. х=4

-х+2у=-4. 1,5х+у=6

ху=6;1. Ху=4,0

Answer 2

To solve the system of equations:

Equation 1: x + y = 7 Equation 2: x - 2y = 4

We can use the method of substitution or elimination to find the values of x and y.

Let's solve it using the method of substitution:

From Equation 1, we can express x in terms of y by subtracting y from both sides: x = 7 - y

Now we substitute this expression for x in Equation 2: 7 - y - 2y = 4

Simplifying the equation: 7 - 3y = 4

Next, we isolate y by subtracting 7 from both sides: -3y = 4 - 7 -3y = -3

Dividing both sides by -3: y = -3 / -3 y = 1

Now that we have the value of y, we can substitute it back into one of the original equations (Equation 1) to find x:

x + 1 = 7 x = 7 - 1 x = 6

Therefore, the solution to the system of equations is x = 6 and y = 1.