Answer:
1) x= 7
b) x = 10
Explanation:
The marks tell us that the side lengths are equal. That means that the angels are equal
4x + 5 = 6x - 9 Subtract 4x from both sides
5 = 2x - 9 Add 9 to both sides
14 = 2x Divide both sides by 2
x = 7
The two lines that are equal have equal opposite angles from the lines. The sum of the interior measures of a triangle is 180
4x + 15 + 4x + 15 +8x -10 =180 Combine line terms
16x + 20 = 180 Subtract 20 from both sides
16x = 160 Divide both sides by 16
x = 10