exam Maths Puzzle Numerical Ability

This is causing stress and can not figure it out?

Solve the system by addition or substitution.
20x - 5y = -12
y = 4x + 3

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exam Other Question

I could use some help on the following. The instructions say: Find the domain for the following function and write your answer using interval notation.

f(x)= inside swuare root is 2x+6

I would appreciate any help.
Thank You
Kay the measure of an angle is 44 more than the measure of its supplement.
find the measure of the angles.