Question

find the value for x
x-8y=20
x+11y=-21

Answer 1

x-8y=20
x+11y=-21

Subtratct both the equations
What do you get?

Answer 2

so x is -3

Answer 3

x-8y=20-(1)
x+11y=-21-(2)
(2)-(1)=>19y=-41
y=-41/19
(1)=>x=20+8y
=20-(8*41/19)
=(20*19-328)/19
=(380-328)/19
=52/19

Answer 4

so what is x

Answer 5

x=52/19
=2.73684
Which will be 3 when rounded off

Answer 6

so what is y

Answer 7

@ajprincess solved it completely .. what's x & y is very clear

Answer 8

y=-41/19
=2.15789
which is equal to 2 when rounded off