Question

Is (1,-4) a solution to the equation y=-2x
a: yes
b:no

Answer 1

(1,-4) means that x = 1 and y = -4

This is because all points are of the form (x,y)

Answer 2

Plug x = 1 and y = -4 into y=-2x


y=-2x

y=-2*1 ... replace x with 1

-4 = -2*1 ... replace y with -4

-4 = -2 ... multiply


Since -4 = -2 is false, this means (1,-4) is NOT a solution to y=-2x


So the point (1,-4) does NOT lie on the line y=-2x