Question

Which is the best first step when solving the following system of equations?

x+y=3
4x-y=7
A Multiply the first equation by 4.
B Add the first equation to the second equation.
C Multiply the second equation by Negative 1.

Answer 1

B

Explanation:

Edge 2021

Answer 2

option B. add the first equation the second, is the answer

using elimination method,

x + y = 3......(1)

4x - y = 7......(2)

once you add (1) and (2), the 'y' terms get cancelled, and you get,

5x = 10

x = 10/5

= 2