Question

5x+3y=8
3x+y=8
solve by substitustion

Answer 1

x = 16

Answer 2

3x + y = 8
y = -3x + 8
now sub this into the other equation
5x + 3y = 8
5x + 3(-3x + 8) = 8
5x - 9x + 24 = 8 -- subtract 24 from both sides
5x - 9x = 8 - 24 -- combine like terms
-4x = - 16
x = 4
now sub 4 in for x in either equation to find y
y = -3x + 8
y = -3(4) + 8
y = -12 + 8
y = -4

check..
3x + y = 8
3(4) + (-4) = 8
12 - 4 = 8
8 = 8 (correct)

x = 4 and y = -4

Answer 3

thanks again it helped alot