Question

Help me please! Somebody, ANYBODY !
-2x+8y=18
-2x+y=11 how do i do this?

Answer 1

Elimination method.
eliminate the x variable by subtracting equations
-2x - (-2x) = 0
8y - y = 7y
18 - 11 = 7
-> 7y = 7
y = 1
substitute back in to find x_value

Answer 2

Substitute y from the 2nd equation into the first eq.
y = 2x+11
-2x+8(2x+11) = 18
-2x + 16x + 88 = 18
14x = -70
x = -5
y = -10+11
y = 1

Answer 3

thank you! but, now how do i get x ?

Answer 4

Or take the value of y and substitute it back into original equation

Answer 5

giorgia already worked it out for you...