Solve the system of linear equations by substitution

y-x=0
2x-5y=9

( explain the steps in order)
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In the 30-60-90 triangle below side s has a length of and side r has a length

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.

Find two numbers if their sum is 91 and the ratio is 6: 7?