Solve the system of equations
y=11-2x
4x-y=7

x=3

y=5

Step-by-step explanation:

y=11-2x     equation 1

4x-y=7     equaton 2

using equation 1 in equation 2 we have:

4x-(11-2x)=7  

4x -11 +2x = 7

6x=7+11

6x= 18

x= 18/6

x=3

so we have

y=11-2(3)

y=11-6

y =5

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh