<PRE><B>Question 434267</B>
Solve using the substitution method
y=3x+1
3y-7x=9
Simplify your answer and type an ordered pair 
:
Use the 1st equation for substitution in the 2nd equation
replace y in the 2nd equation with (3x+1)
3(3x+1) - 7x = 9
9x + 3 - 7x = 9
9x - 7x = 9 - 3
2x = 6
x = {{{6/2}}}
x = 3
:
Use the 1st equation to find y, replace x with 3
y = 3(3) + 1
y = 10
:
The ordered pair: 3, 10
:
:
Check our solutions in the 2nd equation, replace x and y 
3(10) - 7(3) = 9
30 - 21 = 9; confirms our solution of x=3, y=10</PRE>