Question

Find the value of Q in the following system so that the solution to the system is (2,3)

x-2y=-4
3x+5y=Q

Answer 1

Q = 21

Explanation:

`\left\{\begin{array}{ccc}x-2y=-4&(1)\\3x+5y=Q&(2)\end{array}\right\\\\\text{From (2, 3), put x = 2 and y = 3 to (2):}\\\\Q=3(2)+5(3)=6+15=21`