Equations 6005

Solve a system of two equations with two unknowns, x and y:

3x - 4y = 12
-x + 3y = 1

Will the sum of x + y be equal?

Correct answer:

x =  8
y =  3
s =  11

Step-by-step explanation:


3x - 4y =12
-x + 3y =1

3·x - 4·y =12
-x + 3·y =1

3x-4y = 12
x-3y = -1

Row 2 - 1/3 · Row 1 → Row 2
3x-4y = 12
-1.67y = -5


y = -5/-1.66666667 = 3
x = 12+4y/3 = 12+4 · 3/3 = 8

x = 8
y = 3

Our linear equations calculator calculates it.
s=x+y=8+3=11

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