Question

2x-5y=725x+5y=45 помогитееееееее​

Answer 1

Ответ:

(52/27; -17/27)

Объяснение:

2x-5y+25x+5y=7+45

27x=52

x=52/27 (1 25/27)

y=(2x-7)/5

y=(2*(52/27)-7)/5 = -17/27

(52/27; -17/27)

Answer 2

To solve the system of equations:

2x - 5y = 72

5x + 5y = 45

We can use the method of elimination, where we add or subtract the two equations to eliminate one of the variables. In this case, we can eliminate the y variable by adding the two equations together:

2x - 5y + 5x + 5y = 72 + 45

Simplifying this equation, we get:

7x = 117

Dividing both sides by 7, we get:

x = 117/7

x = 16.714 (rounded to three decimal places)

To find the value of y, we can substitute the value of x into one of the original equations. Let's use the first equation:

2x - 5y = 72

Substituting x = 16.714, we get:

2(16.714) - 5y = 72

Simplifying this equation, we get:

33.428 - 5y = 72

Subtracting 33.428 from both sides, we get:

-5y = 38.572

Dividing both sides by -5, we get:

y = -7.714 (rounded to three decimal places)

Therefore, the solution to the system of equations is:

x = 16.714 and y = -7.714