The answer is

or you can replace -1/5 with -0.2
follow the procedures in the attachment please.
Answer:
Ayo its ( $6.40 )
Step-by-step explanation:
I did it for my do now once.
Answer:
(i) an isosceles triangle is a triangle where two angles are equal and one is different
(ii) same as above
(iii) sorry but im not sure
(iv) a=1.41 b=11.31 c=7.07
X=y-7
x=2-8y
both equal x so
subsitute y-7 for x in other equaton
y-7=2-8y
add 8y
9y-7=2
add 7
9y=9
divide 9
y=1
sub back
x=y-7
x=1-7
x=-6
(x,y)
(-6,1)