Question

Solve the following system of equations

1.2x+2.4y= -18
-.8x+ .4y = 6

HELP I need the answer RIGHT NOW ASAP (I spaced it out so you could see it better)!!!!!

Answer 1

x = -9

y = -3

Explanation:

We can first multiply the 2nd equation by -6, so we have:

`-6*[-0.8x+0.4y=6]\\=4.8x-2.4y=-36`

Now, we add up this equation to the 1st equation given to eliminate y and solve for x. Shown below:

`1.2x+2.4y=-18\\4.8x-2.4y=-36\\---------\\6x=-54\\x=-9`

So, we have the value of x to be -9

Now, we substitute this value in 1st equation and solve for y:

`1.2x+2.4y=-18\\1.2(-9)+2.4y=-18\\-10.8+2.4y=-18\\2.4y=-7.2\\y=-3`

The value of y is -3

So,

x = -9

y = -3