Qiestion:
Select all that are true.
A. 6.22 - 4 = 6.28
B. 14 - 0.02 = 0.12
C. 3.31 - 2.25 = 1.06
D. 5.48 - 4.96 = 0.52
E. 41.5 - 33.25 = 29.10
Answer:
C and D are the answer
To find out if they are parallel we need to see if the gradient is the same, to do this we need to get y in terms of x:
assuming the first equation is x+y+7=0
y=-x-7
and
y=x-3
The gradient is the coefficient of x (the number infront of x)
For equation 1 the gradient is -1, and for number 2 it is 1, therefore they are not parallel.
However to check if they are perpendicular we need to see if their gradients multiply to equal -1.
-1*1=-1 therefore they are perpendicular
