book Maths Puzzle Numerical Ability

An architect is disigning a small A-frame cottage for a resort area. A cross-section of the cottage is an isosceles triangle with an area of 98 square feet. The front wall of the c

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Point A- (-2,5). Point B (4, 1).
How would I find the length and the midpoint of segment AB? how would u solve ax+5y=b and 6x+10y=16 when the two equations are the same line.(no graphing) I know that that the first equation is basically half the second equation, and i have