Question 1:
Substitution.
x+y=2
y=-x+2
2x+(-x+2)=4
x=2
(2)+y=2
y=0
Solution: (2,0)
There is one solution
Question 7 is too confusing, just find where the points intersect at (-5,2).
Question 9:
Elimination.
(-1)y=2x+6
y=2x+2
New: -y=-2x-6
0=-4
No Solution
Question 11:
Just look at explanations.
It's (5,17) both lines etc..
Answer:
9.4.
Step-by-step explanation:
9^2 = 81 and 10^2 = 100
So the value of the square root of 89 is between 9 and 10.
The gap between the squares is 100-81 = 19 and the gap between 89 and 81 is 8 so an estimate of the square root would be 9 + 8/19 of the gap between 9 and 10.
9 + 8/19 = 8.42.
3wx/6x * 3wx/9w = w/2 • x/3 = xw/6
Answer: xw/6
