Select all the systems of equations that have exactly one solution. A. y = 3x + 1 y =− 3x + 7
B. y = 3x + 1 y = x + 1
C. y = 3x + 1 y = 3x + 7
D. x + y = 10 2x + 2y = 20
E. x + y = 10 x + y = 12

y = 3x + 1; y =− 3x + 7 are solved at the point  (1, 4)

y = 3x + 1; y = x + 1 are solved at the point (0, 1)

y = 3x + 1; y = 3x + 7 has no solutions

x + y = 10; 2x + 2y = 20 are solved when y=10-x

x + y = 10; x + y = 12 has no solutions

Step-by-step explanation:

The quickest method to  solve the above equations is through transforming the formula to y=mx+b and then graphing the equations.

a reflection across the x-axis , followed by the by a reflection across the y-axis , and then a scale dilation of 0.5 .