SOLUTION: Solve each system by substitution. Determine whether the
equations are independent, dependent, or inconsistent, can someone please help me solve this equation
y= -4x-7
y= 3x
Algebra.Com
Question 246646: Solve each system by substitution. Determine whether the
equations are independent, dependent, or inconsistent, can someone please help me solve this equation
y= -4x-7
y= 3x
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
y= -4x - 7
Since y = 3x we can write the 1st equation:
3x = -4x - 7
add 4x to each side
3x + 4x = -7
7x = -7
Divide both sides by 7
x =
x = -1
:
Find y:
y = 3x
y = 3(-1)
y = -3
:
Check solution in 1st equation, substitute for x and y
y = -4x - 7
-3 = -4(-1) - 7
-3 = +4 - 7
:
x is the independent variable
y is the dependent variable
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