Answer:
A, B, E
Step-by-step explanation:
X+y=-1
x-3y=11
------------- (subtract equation)
4y = -12
y = -12/4
y= -3
-------------- (substitute y)
x-3=-1
x=-1+3
x=2
Answer ----> A (2,-3)
-5x-3y=12
x-3y=-6
you want to multiply the top equation by -1 to swap the signs and make the x's positive like the bottom equation
5x+3y=-12
x-3y=-6
then you have to multiply every value in the bottom equation by 5 so you are able to subtract it from the top equation
5x+3y=-12
5x-15y=-30
---------------- (subtract)
18y=18
y=18/18
y=1
------------------ (substitute y)
x-3=-6
x=-6+3
x=-3
answer = (-3,1)
Answer:
7.6
Step-by-step explanation:
I used a calculator
Answer:
<h2>( 2 , 1 )</h2>
Step-by-step explanation:
2x - 2y = 2
<u>5</u><u>x</u><u> </u><u>+</u><u> </u><u>2</u><u>y</u><u> </u><u>=</u><u> </u><u>1</u><u>2</u>
7x = 14
<h3>
x = 2</h3>
(2x - 2y = 2)-5
<u>(5x + 2y = 12)</u><u>2</u>
-10x + 10y = -10
<u> 10x + 4y = 24</u>
14y = 14
<h3>
y = 1</h3>
x = 2
y = 1
(2,1)
