Ineed the question is in the picture

Write and solve equations here.  Let the two numbers be x and y.  

Then x + 3y = 24, and 5x + 3y = 36.  Solve this system of linear equations.

Note that the first equation can easily be solved for x.  Then x = 24 - 3y.  Subbing 24 - 3y for x in the 2nd eq'n, we get:

5(24 - 3y) + 3y = 36, or   120 - 15y + 3y = 36

                                                    -12y     = 36 - 120, or -12y = -84
                                                                                     -84
                                                       Solving for y:  y = = 7
                                                                                      -12

If y is 7, then x is 24 - 3(7).  Simplifying, x = 24 - 21 = 3.

Then the solution is (3, 7).

By all means insert 3 for x and 7 for y in either of the original equations.  If that equation comes out to be true, you'll know your solution is correct.

Your maths is very weak try yourself this would improve your skills don't depend on others

Ac equals 35 cm long