exam Maths Puzzle Numerical Ability

Can someone please help me solve this problem. I am having trouble understanding how to solve it.
3x+4y=12 with this solutions: (0, ),(2/3, ),( ,0),and (-2/3, ).
Thank you.

Read Solution (Total 0)

exam Other Question

The sum of the squares of two numbers is 145, and the difference of their squares is 17. Which of the following pairs of equations can be used to solve this problem.

I think it is
x^2-y^2=145
x^2+y^2=17 1. As the width of a confidence level increases, the lower bound ________ and the upper bound ________.

2. The batteries used in a digital watch have an operating life