Math question need help with substation please?

In triangle opq right angled at p op=7cm, oq-pq=1 determine the values of sinq and cosq

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

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0