Question

A system of equations is shown below.

What is the value of y for the solution to the system? [2z - y = 3
（エー3y=4
A.2
B.1
c.-1
D.-5

Answer 1

option c

y = -1

Explanation:

2x - y = 3 -----------------(1)

x - 3y = 4 ------------------(2)

from equation (2)

x = 4 + 3y-------------------(3)

substituting the value of x in equation (1)

2(4+3y) - y = 3

8 + 6y - y = 3

5y = 3-8

5y = -5

y = -1

substituting the value of y in equation (3)

x = 4 - 3

x = 1