Question

Just need to know the first one

Answer 1

By solving the equations by elimination, we get x = -2 and y = 4.

Step-by-step explanation:

Step 1; 4x + 2y = 0, take this as equation 1 and

-4x -9y = -28, take this as equation 2.

Since the coefficient of x in equation 1 is 4 and the coefficient of x in equation 2 is -4, simply adding the two equations, we should be able to eliminate x and solve for y.

Step 2; Adding equation 1 and 2, we get

4x + 2y -4x -9y = 0 - 28,

2y - 9y = -7y = -28,

y = $\frac{-28}{-7}$ = 4.

Substituting the value of y in equation 1 we determine the value of x.

4x + 2y = 4x + (2 × 4) = 0, 4x = -8,

x = $\frac{-8}{4}$ = -2.

So for the given equation, x = -2 and y = 4.