Solve this system of equations using the
elimination method.

4x-3y=-10 ans C

2x+3y=4

Step-by-step explanation:

4x-3y=-10eqn 1

2x+3y=4eqn 2

multiply eqn 1 by 2 and eqn 2 by 4

8x-6y=-20

8x+12y=16

subtract eqn 2 from 1

8x-8x ,12-(-6y)=16-(-20)

18y=36

divide both sides by 18

y=2

substitute y=2 in eqn 1

4x-3(2)=-10

4x-6=-10

4x=-10 + 6

4x= -4

divide both sides by 4

x= -1

the correct answer is the second option

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.