Question

Find an equation of a line through (2, 1) and perpendicular to −2x + 4y = 8

a. y = −2x − 3
b. y = −2x + 3
c. y = −2x + 5
d. y = −2x − 1

Answer 1

Hello:
the equation is : y = ax+b
the slope is a : a×(1/2) = -1......( perpendicular to a line with a slope of 1/2) because : -2x+4y =8...y=(1/2)x+2 )

a = -2 y=(-2x+b
the line that passes through (2,1) :1 = -2(2)+b
b =5
the equation is : y = -2x+5