Question 698206
7x+2y=-13
-3x-8y=-23 I am suppose to solve the system by substitution and tell whether it has one no or infinitly solution

-------------------------
7x+2y=-13
-3x-8y=-23
------
Solve the top equation for "y":
y = (-7x - 13)/2
---------
Substitute for "y" and solve for "x":
-3x - 8(-7x-13)/2 = -23
---------
-3x + (56x+104)/2 = -23
-----
-3x + 28x + 52 = -23
25x = -75
x = -3
-------
Solve for "y":
y = (-7x-13)/2
y = (-7*-3-13)/2
----
y = 4
-------
Ans: one solution
=====================
Cheers,
Stan H.
============