What is the value of x?

The correct answer is A. 36°

Explanation.

All triangles have three internal angles. Additionally, in these, if you add the three internal angles the total is always 180°. This implies the first angle which is 79° added to the second angle, which is 65° and the third angle (value of x) should be equal to 180°. This can be solved by subtracting the two angles known from the total 180°.

x + 79° + 65° = 180

x = 180 -79°- 65°

x = 36°

Also, you can know this result is accurate because 36° + 79° + 65° = 180°

x=4, y=4

step-by-step explanation:

y=2x-4;

x+2y=12

we can use substitution since the first equation is solved for y

where ever you see y in the second equation, replace it with 2x-4

x + 2(2x-4) = 12

distribute the 2

x+4x-8 = 12

combine like terms

5x-8=12

add 8 to each side

5x-8+8=12+8

5x=20

divide by 5

5x/5 = 20/5

x =4

we still need to solve for y

y = 2x-4

we know x =4

y = 2(4) -4

y = 8-4

y=4

it is believed to be alfred, lord himself