how to solve?
)The point (4,-2) is the solution to which of the following system of equations?
A) Y = -x + 2 Y = 4X - 2
B) Y = -X + 2 Y = -2 + 4
C) Y = X - 2 Y = X - 6
D) Y = 2X - 10 Y = X – 6
Because both equations in each group are the value of y,
you can set them as equal and solve for x.
A) -x + 2 = 4x - 2
-5x = -4
x = 4/5
NO, does not fit the point
B) -x + 2 = -2 + 4
-x = -2 + 4 - 2
x = 0
NO, does not fit the point
C) x - 2 = x - 6
NO...and impossible
D) 2x - 10 = x – 6
x = 4
y = 2x - 10
y = 2(4) - 10
y = 8 - 10
y = -2
YES, it fits the point
The answer is D) Y = 2X - 10 Y = X – 6