Martha claims that " the sum of two acute angles will form another acute angle" She measured and came up with the following pairs of angles, which one is the counterexample to her statement? (Write the letter of your answer)

A . 30 degrees , 40 degrees

B. 20 degrees , 60 degrees

C. 45 degrees , 45 degrees

D. 40 degrees , 40 degrees

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

the solution is the point

step-by-step explanation:

we have

> equation a

> equation b

adds equation a and equation b

substitute the value of x in equation b to find the value of y

the solution is the point

answer: graph 2

step-by-step explanation: