3. (24 + x) / 2 > 58 <== ur inequality
(24 + x) > 58 * 2
24 + x > 116
x > 116 - 24
x > 92....so she would have to score at least 93 points
4. 6x - 60 > = 510 <== ur inequality
6x > = 510 + 60
6x > = 570
x > = 570/6
x > = 95 <== solution
Just adding the 2 equations eliminates the terms in x (7x + -7x = 0) giving:-
0 + 9y = 9
y = 1
Plug this into the first equation:-
7x + 4(1) = -3
7x = -7
x = -1
Answer x = -1 and y = 1.
