Question

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

Answer 1

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

Answer 2

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

Answer 3

@heather96

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