substutx x and y into the equations:
-2a-6b=-14
-5a-20b=-2
then solve for a and b.
If -1,2 is the solution to the following linear system, what are the values of the coefficents a and b . Show your work to support your answer
2ax-3by= - 14
5ax - 2by = -2
HOW WOULD I SOLVE
2 answers
x = -1 and y = 2
just plug in the values for x and y, and you get
-2a - 6b = - 14
-5a - 4b = -2
Now multiply by 2 on the top and 3 on the bottom to get
-4a - 12b = -28
-15a - 12b = -6
Now subtract and y is eliminated:
11a = -22
a = -2
and now use that to find b.
just plug in the values for x and y, and you get
-2a - 6b = - 14
-5a - 4b = -2
Now multiply by 2 on the top and 3 on the bottom to get
-4a - 12b = -28
-15a - 12b = -6
Now subtract and y is eliminated:
11a = -22
a = -2
and now use that to find b.
1 answer