15 points for who ! need answer fast!

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

I'm confused on this could anyone me and show me what i need to do to solve it.

3x + 4y = 5 x- 3y = -7 solve by substitution