exam Maths Puzzle Numerical Ability

can someone please solve this one...

use Gauss-Jordan elimination and solve this

3x - y = 5
4x + 2 = 10

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exam Other Question

Find the graphic solution to the following system of equations:
y=2x+5 and y-x=4 Please help . Find the equation of the line perpendicular to x+2y =3 that passes through the point (-3,4) answer should be in slope intercept form.
Thank you