Answer:-12
Explanation:
To solve for y, we can use the second equation to isolate x and substitute the result into the first equation:
2x - 5y = 72
2x = 5y + 72
x = (5y + 72)/2
Now we can substitute this expression for x into the first equation:
3x + 4y = -30
3((5y + 72)/2) + 4y = -30
Simplifying the left side:
(15/2)y + 108 + 4y = -30
Combining like terms:
(23/2)y = -138
Dividing both sides by (23/2):
y = -138 * 2/23
Simplifying:
y = -12
Therefore, the value of y that satisfies both equations is -12.