1. since the equations equal each other
2x+19=x+7
-x -x
x+19=7
-19 -19
x= -12
sub into y= x+7
y= -12+7
y= -5
2. x+2y=-7
<span>x+y+23=0
i don't know what the second equation is equal to, i'll assume 0
2y=x-7
y=1/2x-7/2
sub this into x+y+23=0
x+1/2x-7/2+23=0
3/2x+39/2=0
-39/2 -39/2
3/2x= -39/2
x=-39/2 / 3/2
x= -13
sub into y=1/2x-7/2
y=1/2(-13)-7/2
y= -10
3. </span>x+5y=2
<span>x=-4y+5
</span>sub x=-4y+5 into x+5y=2
-4y+5+5y=2
y+5=2
-5 -5
y= -3
sub y =-3 into x =-4y+5
x=-4(-3)+5
x= 17
4. 3x+y=9
<span>y=-5x+9
</span>sub -5x+9 into 3x+y=9
3x+(-5x+9)=9
3x-5x+9=9
-2x+9=9
-9 -9
-2x=0
x=0
sub into y=-5x+9
y=-5(0)+9
y=9
Answer:
C, the plus or minus at the end of a function stands for the point on the y axis going up or down 13.
Step-by-step explanation:
Brainlyest pls I need 1 more to level up
5^0 x 5^4 1 x 625 625
------------- = ---------- = ----- = 1 B
5^3 x 5^1 125 x 5 625
Answer:
the answer is A
because if the dot is filled in it has to be the greater than or equal to or less than or equal to sign. And the side that is shaded in is greater than one. so x must be greater than or equal to 1.
If
then we also have
Pairing up the terms, we can find that
consists of 
terms, so there are copies of 
in the sum 
. Then we find an immediate closed form for the sum:
