Question

Х – 0,5у = 7 если 2х + 4у = - 16 найдите у – 3х

Answer 1

Решение задания смотри на фотографии

Answer 2

To solve the system of equations, we can use the method of substitution or elimination. Let's use the substitution method to find the values of x and y.

Given the equations:

1. x - 0.5y = 7
2. 2x + 4y = -16

Step 1: Solve Equation 1 for x in terms of y. x = 7 + 0.5y

Step 2: Substitute the expression for x from Step 1 into Equation 2. 2(7 + 0.5y) + 4y = -16

Step 3: Solve for y. 14 + y + 4y = -16 5y + 14 = -16 5y = -16 - 14 5y = -30 y = -30 / 5 y = -6

Step 4: Now that we have the value of y, we can find x using Equation 1. x = 7 + 0.5(-6) x = 7 - 3 x = 4

Now, you want to find the value of u - 3x:

u - 3x = u - 3 * 4 = u - 12

Since we don't have more information about the value of u from the given equations, we can't determine the specific value of u - 3x without additional data. The answer is in terms of u, and unless we know the value of u, we cannot simplify it further.