Use addition or substitution to find the value of x for this set of equations.
y = x - 2
7y - 4x = 10

Question

Use addition or substitution to find the value of x for this set of equations.
y = x - 2
7y - 4x = 10

radar · Answer

Perfect for substitution as first equation has an isolated y in terms of x.

so substitute value of y in terms of x in the second equation.  You should get this:
7(x-2) -4x =10  clear the parentheses and get:
7x -14 -4x = 10   Now you are home free, just algebra now solve for x.

radar · Answer

After getting a value for x, substitute in the first equation the value for x.

anonymous · Answer

whats does x =

radar · Answer

7x-14-4x=10  Combine the x terms (just as you have in the past)  What do you get when 7x -4x is combined?

anonymous · Answer

is it -3x

radar · Answer

It is just plain old 3x (positive 7 is larger than -4)
Now you have :   3x-14 = 10 add 14 to both left and right of the equal sign.  Getting
3x-14 +14 = 10 +14    This now grade school arithmetic
3x=24   See now the x term is on the left and the value is on the right.  To solve for x, divide both sides by 3.  What is x = to???

anonymous · Answer

u tell me

radar · Answer

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