Plz help I will give Brainleist! Use the substitution method for solve for x and y.

y = 2x + 10
y = -4x - 2

Find the volume of the described solid. the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x. a) 441b) 147c) 864d) 882

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?