Question

For the following system, use the second equation to make a substitution for x in the first equation.
3x + 2y = 7
x - y + 3 = 0
What is the resulting equation?
3x - y - 3 + 2y = 7
3(y - 3) + 2y = 7
3y - 3 + 2y = 7

Answer 1

from second equation
x = y - 3
so plug this into the first

Answer 2

important - use parentheses around y-3

Answer 3

x=1/5
y=16/5

Answer 4

Look at the question properly lilysue, they are asking for the resulting equation. joeywhite's method is correct.

Answer 5

second on

Answer 6

x=y-3
3(y-3)+2y=7->y=16/5
x=16/5-3=1/5