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Equation for each relationship

Can someone teach me how to do this? I just figured out the f(x) in algebra and now there is g? it is entirely confusing and I am not really sure how to solve questions like this. Please teach me...

2x + 3y = 7 and x - 2y = -7   I need to solve for Y I need help figuring out this equation using the substitution method. I would appreciate a step-by-step procedure to base...

I need a number to put into the equation for x that will set the problem equal to 0. I've been having trouble finding a number.

The end points of a diameter of a circle are (-2,-3) and (-10,-9)   Write an equation of the circle in standard form.

Use the point - slope formula to write an equation of the line that passes through (3,6) and has a slope of m=3. Write the answer in slope - intercept form (if possible).

Use the point - slope formula to write an equation of the line that passes through (1,2) and(-6,-3).Write the answer in slope - intercept form (if possible)