Here's how to find out, and amaze your friends:
2y - 5 = 13
Add 5 to each side:
2y = 18
Divide each side by 2 :
y = 9
-y + 7 = 13 -y = 6 y = -6
[5x+13]
13 ? 15
19
y-13= -5 ----> add 13 to both sidesy-13 +13= -5 +13 ----> simplifyy=8
y = 2x -1 y = 5x -13 So: 5x -13 = 2x -1 5x -2x = 13 -1 3x = 12 x = 4 and by substituting y = 7
5x-y equals 18 = -13
-y + 7 = 13 -y = 6 y = -6
[5x+13]
13 ? 15
26.
x equals -3, and y equals 1.
19
2x+3y=13 3x-y=3 x=2
-13
y-13= -5 ----> add 13 to both sidesy-13 +13= -5 +13 ----> simplifyy=8
y = 15 so that 13= 15 - 2 y-2 = 13 y-2 +2 = 13 +2 y = 15