What is the solution of the system of equations? You can use any method.
y = 3x + 7
y = x – 9
a. (–1, –10) b. (–17, –8) c. (4, 19) d. (–8, –17

Question

What is the solution of the system of equations?  You can use any method.
y = 3x + 7
y = x – 9
a. (–1, –10) b. (–17, –8) c. (4, 19) d. (–8, –17

anonymous · Answer

C. 

Just plug in the x and y values and see if its true or not.

anonymous · Answer

Here is a example $$-10 = 3(-1) + 7$$$$-10 = -3 + 7$$ $$-10 \ne 4$$ Therefore A is not the solution. Now you do this for the other three and thats how you find the solution.

gw2011 · Answer

y=3x+7
y=x-9

-3x+y=7
-x+y=-9  Subtract this equation from the above one

-2x=16
x=-8  Substitute this value into one of the equations to find y

y=x-9
y=-8-9
y=-17

Therefore, the answer is (-8, -17)