SOLUTION: I have a final tomorrow and I need help. It says to use the substitution method on the equation y/2 -x=1 and the other equation (cause it's in systems of equations) is x+y+7=0. Wha
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-> SOLUTION: I have a final tomorrow and I need help. It says to use the substitution method on the equation y/2 -x=1 and the other equation (cause it's in systems of equations) is x+y+7=0. Wha
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Question 1061087: I have a final tomorrow and I need help. It says to use the substitution method on the equation y/2 -x=1 and the other equation (cause it's in systems of equations) is x+y+7=0. What do I do? Found 2 solutions by josgarithmetic, MathTherapy:Answer by josgarithmetic(39620) (Show Source):
You can put this solution on YOUR website! Pick an equation and solve for one variable in terms of the other. Substitute this expression into the other equation and solve for the single variable. Now use this found variable's value to evaluate the other variable.
You have two equations and two variables, so you have four ways to go. Try to pick the way that seems easiest.
Substitute this for x in the OTHER equation. Solve for the value of y.
You can put this solution on YOUR website!
I have a final tomorrow and I need help. It says to use the substitution method on the equation y/2 -x=1 and the other equation (cause it's in systems of equations) is x+y+7=0. What do I do?
What you DON'T DO IS what the other person suggested. It's TOTAL NONSENSE!
Is it: ? You have to use PARENTHESES
If it's the FORMER, then just ADD x to both sides to get: ===== eq (i)
x + y + 7 = 0 ------- eq (ii)
You then substitute the value for x into eq (ii) and solve for y
Then use the value of y to solve for and determine the value of x
If it's the LATTER, then just solve eq (ii) for x or y, and substitute that value into eq (i)
That's all.....nothing COMPLEX!!
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