Answer:
mÐ1 = 45
Explanation:
If Ð1 and Ð2 are congruent, then mÐ1 = mÐ2.
We have mÐ1 = 10x - 5 and mÐ2 = 6x + 15.
The equation:
10x - 5 = 6x + 15 add 5 to both sides
10x - 5 + 5 = 6x + 15 + 5
10x = 6x + 20 subtract 6x from both sides
10x - 6x = 6x - 6x + 20
4x = 20 divide both sides by 4
4x : 4 = 20 : 4
x = 5
Put the value of x to the expression 10x - 5:
10(5) - 5 = 50 - 5 = 45