Answer:
i think is D
i hope it’s help you but if not DO NOT FORGET STAY SAFE AT HOME
Answer:
14
Step-by-step explanation:
5x-7=3x+21
2x=28
x=14
Answer:
m = 
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
y = - 4x + 7 is in this form with slope m = - 4
Given a line with slope m then the slope of a line perpendicular to it is
= -
= -
= 
Hence the value of m = 