Question

x+y=100
8x+7y=760
URGENT!!

es LA MISMAAAAAAAAAAAAAAAA

Answer 1

y=100-x
8x+7(100-x)=760
8x+700-7x=760
8x-7x=760-700
x=60
y=100-40=60

Answer 2

x+y=100
8x+7y=760

-7x-7y=-700
8x+7y=760

x=60

8(60)+7y=760
7y+480=760
7y=280
y=40

________________
60+40=100
8(60)+7(40)=760

100=100
480+280=760

100=100
760=760

:D