Select all the systems of equations that have exactly one solution.
y = 3x + 1
y =− 3x + 7

y = 3x + 1
y = x + 1

y = 3x + 1
y = 3x + 7

y =− x + 10
y =− 1x + 10

y =− x + 10
y =− x + 12

a, c

Step-by-step explanation:

because they have the same equations

c. 65°

step-by-step explanation:

we are given a triangle with two known angles, 62° and 53°, while the third angle x is unknown and we are to find its value.

we know that the sum of angles in a triangle is equal to a total of 180 degrees. so we can write it as:

x + 62° + 53° = 180°

solving to find the value of x:

x = 180 - (62 + 53) = 65°

therefore, the value of x in this triangle is 65°.

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1