Question

ALGEBRA HELP. WILL FAN & MEDAL :)

4. The point (2, 1) is the solution of which of the following systems of equations?
A) y = -2x + 5 and y = 2x + 2
B) y = -2x + 5 and y = 2x - 2
C) y = x + 3 and y = 3x - 5
D) y = -x + 3 and y = 3x - 5

5. For which of the following values of m would the system of equations y = 4x + 1 and y = mx - 5 have no solutions?
A) 4
B) 1
C) -5
D) -4

Answer 1

#4 is D? How did you get that answer? Can you please show me the step-by-step solution?

Answer 2

@KamiBug

Answer 3

Post only one question at a time, please.

You are given the point (2,1). This tells us that x=2 and y=1.
Substitute x =2 and y=1 into both equations in possible answer A.
Are both equations then true? If so, (2,1) is a solution. If not, then (2,1) is not a solution of set A, and you'll need to continue on to set B.

Answer 4

the point 2,1 is saying that
2 , 1
x , y

so... with those values for "y" and "x", as mathmale suggested, test the given choices
see which one gives you a valid EQUATion