8.) Solve the following system of equations y + 4x = 8 and 5x + 2y = 13
(A) 1, 4*********
(B) 3/2, 1/2
(C) -1/2, 4

Question

8.) Solve the following system of equations y + 4x = 8 and 5x + 2y = 13
	 (A) 1, 4*********
	 (B) 3/2, 1/2
	 (C) -1/2, 4

anonymous · Answer

Substitute the first equation for Y in the second equation...

anonymous · Answer

5x+2(-4x+8)=13

phi · Answer

yes.

Though you can use substitution, elimination (especially if you do more than 2 variables) is preferable.

in the order   Ax+By= constant we have  4x +1 y= 8 , and 5x + 2y = 13
dropping x,y
4 1 8
5 2 13
multiply the top row by -5/4 and add to the 2nd row
4 1 8
0 3/4 3
backsolve
3/4 y = 3
y= 4

use the first row, with y=4
4x+4= 8
x=1

anonymous · Answer

Thank you. It is the right answer

anonymous · Answer

Thank you. It is the right answer

anonymous · Answer

Thank you. It is the right answer