How do I solve 4x + 3y = -1 3x +y = 3 using subsitution

Question

anonymous · Answer

4x + 3y = -1 
3x +y = 3
1st solve for x or y in the first equation
i'll solve for x in first one
x = -(3/4)*y-1/4

2nd  plug that into second eq  and solve for the only variable. In this case it is y

3(-(3/4)*y-1/4)+y= 3
y=-3 :) 


3rd since now we have  y=-3 we can plug that into first eq or second eq and just solve for the remaining variable which is x.

i'll pick the second eq
3x +y = 3

3x+(-3)=3
x=2

so solution is    x=2   y=-3

anonymous · Answer

Thank you soo much :) I appreciate it!!!

mathslover · Answer

@heather96

Welcome to openstudy