The common solution of the equations 2x-y = 7 and X + 2Y = - 4 is ()

The common solution of the equations 2x-y = 7 and X + 2Y = - 4 is ()

2x-y=7
x+2y=-4
4x-2y=14
5x=14-4=10
x=2
y=-3
The common solution of 2x-y = 7 and X + 2Y = - 4 is (x = 2, y = - 3)

The common solution of equation y = 2x-3 and equation 3x + 2Y = 1 is______ ．

According to the meaning of the question: y = 2x − 33x + 2Y = 1, solving the equations: x = 1y = − 1. So the answer is: x = 1y = − 1

Given that M is a root of the equation x ^ 2-x-7 = 0, then the value of m ^ 2-m + 96 is
A：96
B：-96
C: 96 or - 96
D：103

x^2-x-7=0
Because M = X
So m ^ 2-m-7 = 0
m^2-m=7
that
m^2-m+96
=7+96
=103
Choose D

50% x + 15 = 30

50％x+15=30
0.5x=30-15
0.5x=15
x=15÷0.5
=30