Question

x-y=2
y=4-2x
solve system using substitution
please show me steps i did this like 7 times and didnt get it right

Answer 1

You will substitute for either the x or the y. In this case the y would be the best choice as it is already in the form for substitution.

Answer 2

Taking the first equation we substitute for the y and will now have;

x-(4-2x)=2. Now we remove the parenthesis being careful with signs.

x-4+2x = 2 Combine similar terms getting
3x-4 =2 Now add 4 to both sides of the equal sign resulting in

3x=6 Dividing both sides by 3 solves for x giving:
x=2
Now we solve for y by plugging in the value 2 for x, I choose the 2nd equation.
y=4-2(2)
y=4-4
y=0

Answer 3

ohhhh thankkk youuuu i didnt put parenthesis so i got confused

Answer 4

You are welcome, those signs preceding parentheses can be a bear!