book Maths Puzzle Numerical Ability

solve by using the addition method

x-y=100
0.20x+0.06y=150

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book Other Question

I am trying to help a friend with her homework, but we have both hit a brick wall, can someone send us the process to solve the following equation?
2/5(10x+25)=-10-4(x+3)
Thank you so much for your help.
Patty & Sunshine Using the point-slope formula, what is the equation of the line that passes through the points (1,5) and (0,0)? This is a multiple choice A. y=5x B.y=5x-1 C. y=x D. y=5x+10