Answer:
BEDMAS/PEMDAS - [61 - (5x6)] x 42 + 5
Step-by-step explanation:
Scientific notation, also called pattern or notation in exponential form, is a way of writing numbers that accommodate values too large (100000000000) or small (0.00000000001) to be written in a conventional manner.
The use of this notation is based on powers of 104
Example:
Big numbers:

Small numbers:

However, in areas such as physics and chemistry, scientific notation is important to make approximations such as:
mass of a proton
mass of an electron and others.
it's really just your own opinion of which is difficult or easier but in my opinion Substitution is more difficult because you have to substitute in the different equations, and it can take more time. I personally like Elimination best because it cancels out variables and can be quicker to use. hope this helps:)
Answer:D
Step-by-step explanation:
I think your question is missed of key information, allow me to add in and hope it will fit the original one.
Please have a look at the attached photo.
My answer:
A solution is (-1,4) means that point of intercept is (-1,4)
<=> when x=-1 so y = 4 for both equations
From the 4 possible answers, only graph D meets the requirement.
Hope it will find you well