Answer:
a
Step-by-step explanation:
Answer:
Step-by-step explanation:
Elimination method involves making two coefficients equal in order to get rid of one variable and finding the other.
Graphing method is using the intercepts the plotting your points on a graph.
Substitution method involves using change of subjects and then substituting the equation for the variable.
Its a square( same sides)
its a right-angled triangle as half
18²=a²+a²
a=12.73
