exam Maths Puzzle Numerical Ability

Solving systems of equations using matrices:

4x + y = 7
-5x - y + z - w = 1
z+w = 7

I have z = 7 and know that w is any real number so far but am stuck solving for x and y. Help please.

Read Solution (Total 0)

exam Other Question

a fraction has value 2/3. when 15 is added to its numerator, the fraction equals the reciprocal of the value of the original fraction. find the original number. PLEASE HELP!!!!!!!! I really need help with this problem. The problem says to find two consecutive intergers whose product is 90, it must be solved algebraically. Thank You.