2x-3y=13...(1)
2x+4y=-8...(2)
Multiply equation 2 by -1 to eliminate x
2x-3y=13
+ -2x-4y=8
—————
-7y=21
y=-3
Substitute y=-3 into equation 2
2x+4(-3)=-8
x=2
Therefore, the solution to the system is (2, -3)
Answer:
13
Step-by-step explanation:
n = the number
2n - 17 = 9
2n = 26
n = 13
~Hope this Helps!~
It rises to the right so the slope is negative
Slope = rise / run = 18 / -9 = -2
The y intercept is at y = -3 so using the form y = mx + b we get
y = -2x - 3 which is option B (answer)
The sum of the arithmetic sequence given by
<span>an = 0.05(n – 1) – 0.6
will be given by:
a1=0.05(1-1)-0.6=-0.6
a2=0.05(2-1)-0.6=-0.55
a3=0.05(3-1)-0.6=-0.5
a4=0.05(4-1)-0.6=-0.45
a5=0.05(5-1)-0.6=-0.4
thus the summation will be:
-0.6+(-0.55)+(-0.5)+(-0.45)+(-0.4)
=-2.5
hence
S5=-2.5</span>
Lets change x²=y, so we have equation y²+6y-7=(y-1)(y+7)
make change back so (y-1)(y+7)= (x²-1)(x²+7)=(x²-1²)(x²+7)=(x+1)(x-1)(x²+7)
