x + y = 10
y = x + 8
so,
x + (x + 8) = 10
2x + 8 = 10
2x + 8 - 8 = 10 - 8
2x = 2
x = 1 and y = 9 because
y = x + 8 y = 1 + 8 y = 9
x + 10 = 18 18 - 10 = x 18 -10 = 8 x = 8
Add: 5x - y + x + y + 8 + 10 ie 6x = 18 so x = 3 and y = 7
x=-8
10
Presumably this is an equation in which the value of x is to be found. 7x+8 = 4x-10 7x-4x = -10-8 3x = -18 x = -6
(1, 9)
8.
-2
6
x = -8
x + 10 = 18 18 - 10 = x 18 -10 = 8 x = 8
x + y = 10 y = x + 8 so, x + (x + 8) = 10 2x + 8 = 10 2x + 8 - 8 = 10 - 8 2x = 2 x = 1 and y = 9 because y = x + 8 y = 1 + 8 y = 9
134
10 x 3 + 8 x 3 30 + 24 54 10 times 3 plus 8 times 3 equals 54.
x-2+4=-8 x+2=-8 x=-10
5x+2=x+10 5x-x=10-2 4x=8 x=2
x= 9