Answer:
x = 6; XZ = 27cm
Step-by-step explanation:
Since 4x + 3 is the whole line and the other two equations equal the full line, I will set up the equation as 4x + 3 = the sum of the other two lines since they are equal to each other.
4x + 3 = 8 + 2x + 7
4x + 3 = 15 + 2x
Isolate the variable
Subtract 2x from both sides
2x + 3 = 15
Subtract 3 from both sides
2x = 12
Divide 2 from both sides
x = 6
To solve for the full line, plug in 6 for x for the equation that represents the full line
4(6) + 3
24 + 3
27
