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
x = 1, y = 9. Here's one way to solve:Since y = x + 8, from the second equation, substitute (x + 8) for y in the first equation: x + (x+8) = 10 --> 2x + 8 = 10, and 2x = 2, so x = 1.Now y = x + 8, so substitute x=1 and get y = 1 + 8 = 9. Check your answer in the first equation: [x+y=10]: 1+9=10, which checks out.
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 + 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
x = -8
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