Question

X+3y=-7 2x+15y=-17хелп​

Answer 1

Ответ: х=8,5;, у=0,5

х=-7-3у

2*(-7-3у)+15у=-17

-14-6у=-17

-6у=-17+14=-3

у=-3/-6=0,5

х=-7-3*0,5=-7-1,5=-8,5

Пошаговое объяснение:

Answer 2

Пошаговое объяснение:

3x-y=17 (*3)

2x+3y=-7

9x-3y=51

2x+3y=-7

11x=44

x=4

3y=-15

y=-5

Answer 3

To solve the system of equations:

1. X + 3y = -7
2. 2x + 15y = -17

We can use the method of substitution or elimination. Let's use the elimination method:

First, let's multiply equation 1 by 2 to make the coefficients of x in both equations the same:

2(x + 3y) = 2(-7) 2x + 6y = -14

Now, we can subtract equation 2 from this new equation to eliminate x:

(2x + 6y) - (2x + 15y) = -14 - (-17) 2x + 6y - 2x - 15y = -14 + 17 -9y = 3 y = 3 / -9 y = -1/3

Now, substitute the value of y back into equation 1 to find x:

x + 3(-1/3) = -7 x - 1 = -7 x = -7 + 1 x = -6

So, the solution to the system of equations is x = -6 and y = -1/3.