Steps:
1. Take -x + 2y= 21
2. Add x on both sides
2y= x + 21
3. Divide everything by 2
Y= 1/2x + 10.5
4. Substitute the y in 7x + 2y= -19 for 1/2x + 10.5
7x + 2(1/2x + 10.5)= -19
5. Multiply everything in parentheses
7x + x + 21= -19
8x + 21= -19
6. Subtract 21 on both sides
7. 8x=-40
8. Divide each side be 8
9. Your answer is
X=-5
(x-1)(x+1)(x-3)(x+3)
x²-y² formula
Mark brainliest please
Answer:
subtract by -2 on both side
-4x+2-2>-14-2
-4x>-16
dividing by -4 on both side
-4x/-4>-16/-4
then
x>4
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