Help im confused.

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

What is the expression in factored form? -x^2 + 3x + 28 a. (x-7)(x-4) b. -(x-7)(x+4) c. (x+4)(x+7) d. -(x-4)(x+7)