Which systems of equations have no solution? x + 4y = 23
-3x = 12y + 1.
2x + y = 17
-4x = 2y - 34.
2x + 4y = 22
-x = 2y - 11.
3y = 10 - x
2x + 6y = 7.
2x + y = 15.
x = 15 - 2y
y = 13 - 2x
4x - y = -1.

In trapezoid efgh, m∠gfe=63∘. identify m∠ghe. !

Use addition and subtraction to simplify the following polynomials. a. add polynomials: (3 – 4x + 8x^2) + (–6 + 2x – 5x^2) step 1: rewrite the polynomials without the parentheses. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial. b. subtract polynomials: (3x – 5 – 7x^2) – (–2 + 6x^2 – 5x) step 1: rewrite the polynomials without the parentheses. remember to multiply each term in the second parentheses by –1. show your work. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial.

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m