Originally Posted by
princess_anna57 Solve:
2x + 4 = 4
3x - y = 1
Please double check that you did not make a typo here.
2x + 4 = 4
2x = 4 - 4
2x = 0
x = 0
We now know x = 0
3x - y = 1
3(0) - y = 1
y = -1
Thus:
x = 0
y = -1
Solve:
x - 2y = 7
2x + y = 4
x - 2y = 7
x = 7 + 2y (Set this value for x into the second equation)
2(7 + 2y) + y = 4
14 + 4y + y = 4
5y = -10
y = -2
Now we have a value for y. (y = -2)
Set this value into the first equation.
x -2(-2) = 7
x + 4 = 7
x = 3
Please give step by step instructions. Thank you.