For this case we have the following system of equations:

We solve by the substitution method:
We substitute the first equation in the second equation:

We apply distributive property considering that 

We subtract 69 from both sides of the equation:

We divide by 8 on both sides of the equation:

We look for the value of the variable y:

Thus, the solution of the system is 
Answer:

Answer:
Step-by-step explanation:
18 = (240/100) x what;
what = 18 x (100/240);
what = 1800/240;
what = 7.5;
Answer:
14
Step-by-step explanation:2.5x3=10+2+2=14
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