Hey there! :D
So, you know the x value. Plug that value in.
-3(-5)+7y= 5(-5)+2y
15+7y= -25+2y
Subtract 15 on both sides.
7y= -35+2y
Subtract 2y on both sides.
5y=-35
Divide both sides by 5.
y=-7.
(-5,-7) <=== the solution.
I hope this helps!
~kaikers
Answer:
/_FCB
Step-by-step explanation:
As, supplementry means they add up to 180°
So a straight angle = /_DCB = 180°
So /_DCF + /_x = /_DCB
So, /_x = /_FCB
So answer = /_FCB
Answer:
x=√154 over 7 , −√154 over 7
Step-by-step explanation:
Answer:
(4,11/2)
Step-by-step explanation:
5x-2y=9
12x-8y=4
A quick look will tell us that neither the x- nor the y- coefficient is the same in both equations, so combining the two by addition or subtraction. We can see that 2 is a multiple of 8, since 2 x 4 = 8. We should multiply the first equation by 4.
4(5x-2y=9)
Now we need to decide if we should add or subtract the equations.
20x-8y=36
12x-8y=4
Since we need to have a -8 and a +8 to eliminate the variables, we should subtract them. Change all the signs of the second equation and combine.
20x-8y=36
-12x-8y=4
----------------
8x=32
Divide both sides by 8 to get the x-value:
x=4
Now that we have our x-value, we need to plug in the y-value.
5x-2y=9
5(4)-2y=9
20-2y=9
-2y=-11
y=11/2
So our solution is (4,11/2)
Let's check our work.
5x-2y=9
5(4)-2(11/2)=9
20-22/2=9
20-11=9
9=9
12x-8y=4
12(4)-8(11/2)=4
48-88/2=4
48-44=4
4=4
Our solution is correct.