Substitution 4644

Solve the system of equations by substitution, comparison, and addition method and perform the test:
4x + y = 5
3x-5y = 21

Correct answer:

x =  2
y =  -3

Step-by-step explanation:


4x+y=5
3x-5y=21

4·x+y=5
3·x-5·y=21

4x+y = 5
3x-5y = 21

Row 2 - 3/4 · Row 1 → Row 2
4x+y = 5
-5.75y = 17.25


y = 17.25/-5.75 = -3
x = 5-y/4 = 5+3/4 = 2

x = 2
y = -3

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