exam Maths Puzzle Numerical Ability

please solve this problem: find the points of intersection of the straight line 7x+y=25 and the circle x^2+y^2=25

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I need a lot of help with theses problems. Your help will be greatly appreciated, thank you!

A. 3x - 6y = 12

B. 2x - y = -4

These two are the problems that I need help with, thank you a lot. Write the equation of the line, in slope-intercept form, that contains the points: (7,4) and (-8,4)